1
|
Monini V, Bonechi M, Bazzicalupi C, Bianchi A, Gentilesca P, Giurlani W, Innocenti M, Meoli A, Romano GM, Savastano M. Oxygen reduction reaction (ORR) in alkaline solution catalysed by an atomically precise catalyst based on a Pd(II) complex supported on multi-walled carbon nanotubes (MWCNTs). Electrochemical and structural considerations. Dalton Trans 2024; 53:2487-2500. [PMID: 38193252 DOI: 10.1039/d3dt03947a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2024]
Abstract
A new atomically precise, single-ion catalyst (MWCNT-LPd) for ORR (oxygen reduction reaction), consisting of a Pd(II) complex of a tetraazacycloalkane anchored on multiwalled carbon nanotubes, has been prepared through a supramolecular approach ensuring a uniform distribution of catalytic centres on the support surface. A tetraazacycloalkane was chosen to saturate the four coordination sites of the typical square planar coordination geometry of Pd(II) with the aim of ascertaining whether the metal ion must have free coordination sites to function effectively in the ORR or whether, as predicted by quantum mechanical calculations, the catalytic effect can be originated from an interaction of O2 in the fifth coordinative position. The results clearly demonstrated that tetracoordination of Pd(II) does not influence its catalytic capacity in the ORR. Electrodes based on this catalyst show ORR performance very close to that of commercial Pt electrodes, despite the low Pd(II) content (1.72% by weight) in the catalyst. The onset potential (Eon) value and the half-wave potential (E1/2) of the catalyst are, respectively, only 53 mV and 24 mV less positive than those observed for the Pt electrode and direct conversion of O2 to H2O reaches 85.0%, compared to 89% of the Pt electrode. Furthermore, a preliminary galvanostatic test (simulating a working fuel cell at a fixed potential) showed that the catalyst maintains its efficiency continuing to produce water throughout the process (the average number of electrons exchanged over time per O2 molecule remains close to 4).
Collapse
Affiliation(s)
- Valeria Monini
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy.
| | - Marco Bonechi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy.
| | - Carla Bazzicalupi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy.
| | - Antonio Bianchi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy.
- National Interuniversity Consortium of Materials Science and Technology (INSTM), Research Unit of Florence, Via G. Giusti 9, 50121 Florence, Italy.
| | - Pietro Gentilesca
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy.
| | - Walter Giurlani
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy.
| | - Massimo Innocenti
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy.
- National Interuniversity Consortium of Materials Science and Technology (INSTM), Research Unit of Florence, Via G. Giusti 9, 50121 Florence, Italy.
| | - Arianna Meoli
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy.
| | - Giammarco Maria Romano
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy.
| | - Matteo Savastano
- National Interuniversity Consortium of Materials Science and Technology (INSTM), Research Unit of Florence, Via G. Giusti 9, 50121 Florence, Italy.
- Department of Human Sciences for the Promotion of Quality of Life, University San Raffaele Roma, Via di Val Cannuta 247, 00166 Rome, Italy
| |
Collapse
|
2
|
Bazzicalupi C, Grimmer C, Nikolayenko IV. Old Acquaintances and Novel Complex Structures for the Ni(II) and Cu(II) Complexes of bis-Chelate Oxime-Amide Ligands. Molecules 2024; 29:522. [PMID: 38276599 PMCID: PMC10819512 DOI: 10.3390/molecules29020522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 01/15/2024] [Accepted: 01/17/2024] [Indexed: 01/27/2024] Open
Abstract
In the process of systematically studying the methylhydroxyiminoethaneamide bis-chelate ligands with polymethylene spacers of different lengths, L1-L3, and their transition metal complexes, a number of new Ni(II) and Cu(II) species have been isolated, and their molecular and crystal structures were determined using single-crystal X-ray diffraction. In all of these compounds, the divalent metal is coordinated by the ligand donor atoms in a square-planar arrangement. In addition, a serendipitously discovered new type of neutral Ni(II) complex, where the propane spacer of ligand L2 underwent oxidation to the propene spacer, and one of the amide groups was oxidised to the ketoimine, is also reported. The resulting ligand L2' affords the formation of neutral planar Ni(II) complexes, which are assembled in the solid state on top of each other, and yield two polymorphic structures. In both structures, the resulting infinite, exclusively parallel metal ion columns in ligand insulation may serve as precursor materials for sub-nano-conducting connectors. Overall, this paper reports the synthesis and characterisation of seven new anionic, cationic, and neutral Ni(II) and Cu(II) complexes, their crystal structures, as well as experimental and computed UV-Vis absorption spectra for two structurally similar Ni(II) complexes, yellow and red.
Collapse
Affiliation(s)
- Carla Bazzicalupi
- Department of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
| | - Craig Grimmer
- School of Chemistry and Physics, University of KwaZulu-Natal, Private Bag X01, Scottsville 3209, Pietermaritzburg 3200, South Africa; (C.G.); (I.V.N.)
| | - Igor Vasyl Nikolayenko
- School of Chemistry and Physics, University of KwaZulu-Natal, Private Bag X01, Scottsville 3209, Pietermaritzburg 3200, South Africa; (C.G.); (I.V.N.)
| |
Collapse
|
3
|
Castro F, Gancheff JS, Ramos JC, Seoane G, Bazzicalupi C, Bianchi A, Ridi F, Savastano M. A Norbornadiene-Based Molecular System for the Storage of Solar-Thermal Energy in an Aqueous Solution: Study of the Heat-Release Process Triggered by a Co(II)-Complex. Molecules 2023; 28:7270. [PMID: 37959690 PMCID: PMC10650538 DOI: 10.3390/molecules28217270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 10/23/2023] [Accepted: 10/23/2023] [Indexed: 11/15/2023] Open
Abstract
It is urgent yet challenging to develop new environmentally friendly and cost-effective sources of energy. Molecular solar thermal (MOST) systems for energy capture and storage are a promising option. With this in mind, we have prepared a new water-soluble (pH > 6) norbornadiene derivative (HNBD1) whose MOST properties are reported here. HNBD1 shows a better matching to the solar spectrum compared to unmodified norbornadiene, with an onset absorbance of λonset = 364 nm. The corresponding quadricyclane photoisomer (HQC1) is quantitatively generated through the light irradiation of HNBD1. In an alkaline aqueous solution, the MOST system consists of the NBD1-/QC1- pair of deprotonated species. QC1- is very stable toward thermal back-conversion to NBD1-; it is absolutely stable at 298 K for three months and shows a marked resistance to temperature increase (half-life t½ = 587 h at 371 K). Yet, it rapidly (t½ = 11 min) releases the stored energy in the presence of the Co(II) porphyrin catalyst Co-TPPC (ΔHstorage = 65(2) kJ∙mol-1). Under the explored conditions, Co-TPPC maintains its catalytic activity for at least 200 turnovers. These results are very promising for the creation of MOST systems that work in water, a very interesting solvent for environmental sustainability, and offer a strong incentive to continue research towards this goal.
Collapse
Affiliation(s)
- Franco Castro
- Área Química Inorgánica, Departamento Estrella Campos, Facultad de Química, Universidad de la República, Gral. Flores 2124, Montevideo 11800, Uruguay;
- Laboratorio de Química Fina, Instituto Polo Tecnológico de Pando, Facultad de Química, Universidad de la República, By Pass de Rutas 8 y 101 s/n, Pando 91000, Uruguay;
- Graduate Program in Chemistry, Facultad de Química, Universidad de la República, Montevideo 11800, Uruguay
| | - Jorge S. Gancheff
- Área Química Inorgánica, Departamento Estrella Campos, Facultad de Química, Universidad de la República, Gral. Flores 2124, Montevideo 11800, Uruguay;
| | - Juan C. Ramos
- Laboratorio de Química Fina, Instituto Polo Tecnológico de Pando, Facultad de Química, Universidad de la República, By Pass de Rutas 8 y 101 s/n, Pando 91000, Uruguay;
- Área Química Orgánica, Departamento de Química Orgánica, Facultad de Química, Universidad de la República, Av. Gral. Flores 2124, Montevideo 11800, Uruguay;
| | - Gustavo Seoane
- Área Química Orgánica, Departamento de Química Orgánica, Facultad de Química, Universidad de la República, Av. Gral. Flores 2124, Montevideo 11800, Uruguay;
| | - Carla Bazzicalupi
- Department of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Italy; (C.B.); (A.B.); (F.R.)
| | - Antonio Bianchi
- Department of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Italy; (C.B.); (A.B.); (F.R.)
| | - Francesca Ridi
- Department of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Italy; (C.B.); (A.B.); (F.R.)
- CSGI Consortium, Via della Lastruccia, 3, 50019 Sesto Fiorentino, Italy
| | - Matteo Savastano
- Dipartimento di Scienze Umane e Promozione della Qualità della Vita, Università Telematica San Raffaele Roma, Via di Val Cannuta 247, 00166 Roma, Italy
| |
Collapse
|
4
|
Savastano M, López de la Torre MD, Pagliai M, Poggi G, Ridi F, Bazzicalupi C, Melguizo M, Bianchi A. Crystal engineering of high explosives through lone pair-π interactions: Insights for improving thermal safety. iScience 2023; 26:107330. [PMID: 37636051 PMCID: PMC10448033 DOI: 10.1016/j.isci.2023.107330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 06/27/2023] [Accepted: 07/05/2023] [Indexed: 08/29/2023] Open
Abstract
In this high-risk/high-reward study, we prepared complexes of a high explosive anion (picrate) with potentially explosive s-tetrazine-based ligands with the sole purpose of advancing the understanding of one of the weakest supramolecular forces: the lone pair-π interaction. This is a proof-of-concept study showing how lone pair-π contacts can be effectively used in crystal engineering, even of high explosives, and how the supramolecular architecture of the resulting crystalline phases influences their experimental thermokinetic properties. Herein we present XRD structures of 4 novel detonating compounds, all showcasing lone pair-π interactions, their thermal characterization (DSC, TGA), including the correlation of experimental thermokinetic parameters with crystal packing, and in silico explosion properties. This last aspect is relevant for improving the safety of high-energy materials.
Collapse
Affiliation(s)
- Matteo Savastano
- Department of Human Sciences and Quality of Life Promotion, University San Raffaele Roma, Via di Val Cannuta 247, 00166 Rome, Italy
- Department of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
| | | | - Marco Pagliai
- Department of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
| | - Giovanna Poggi
- Department of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
- CSGI, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino (FI), Italy
| | - Francesca Ridi
- Department of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
- CSGI, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino (FI), Italy
| | - Carla Bazzicalupi
- Department of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
| | - Manuel Melguizo
- Department of Inorganic and Organic Chemistry, University of Jaén, 23071 Jaén, Spain
| | - Antonio Bianchi
- Department of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
| |
Collapse
|
5
|
Nocentini A, Bonardi A, Bazzicalupi C, Alterio V, Esposito D, Monti SM, Smietana M, De Simone G, Supuran CT, Gratteri P, Winum JY. 6-Substituted Triazolyl Benzoxaboroles as Selective Carbonic Anhydrase Inhibitors: In Silico Design, Synthesis, and X-ray Crystallography. J Med Chem 2023. [PMID: 37283561 DOI: 10.1021/acs.jmedchem.3c00433] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Benzoxaborole is currently a scaffold of great relevance in medicinal chemistry. In 2016, it was reported to be a new and valuable chemotype for designing carbonic anhydrase (CA) inhibitors. Herein, using an in silico design, we report the synthesis and characterization of substituted 6-(1H-1,2,3-triazol-1-yl)benzoxaboroles. 6-Azidobenzoxaborole was described for the first time as a molecular platform to prepare libraries of inhibitors by a copper(I)-catalyzed azide-alkyne cycloaddition viaa click chemistry strategy. With inhibition constants below 30 nM, some derivatives, such as compound 20, showed efficacy as selective hCA VII and IX inhibitors. The design hypothesis was validated by crystallographic investigation on the hCA II/20 adduct, which provided explanations over the different inhibition behavior observed against the five evaluated hCA isoforms. Overall, this study identified 20 as a new promising lead compound to develop novel anticancer agents targeting the tumor-associated hCA IX but also potent neuropathic pain relievers targeting hCA VII.
Collapse
Affiliation(s)
- Alessio Nocentini
- NEUROFARBA Department, Pharmaceutical and Nutraceutical Section, University of Florence, Via U. Schiff 6, 50019 Sesto Fiorentino, Firenze, Italy
- NEUROFARBA Department, Pharmaceutical and Nutraceutical Section, Laboratory of Molecular Modeling Cheminformatics & QSAR, University of Florence, Via U. Schiff 6, 50019 Sesto Fiorentino, Firenze, Italy
| | - Alessandro Bonardi
- NEUROFARBA Department, Pharmaceutical and Nutraceutical Section, University of Florence, Via U. Schiff 6, 50019 Sesto Fiorentino, Firenze, Italy
- NEUROFARBA Department, Pharmaceutical and Nutraceutical Section, Laboratory of Molecular Modeling Cheminformatics & QSAR, University of Florence, Via U. Schiff 6, 50019 Sesto Fiorentino, Firenze, Italy
| | - Carla Bazzicalupi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Vincenzo Alterio
- Institute of Biostructures and Bioimaging, Consiglio Nazionale delle Ricerche, Via Pietro Castellino, 111, 80131 Naples, Italy
| | - Davide Esposito
- Institute of Biostructures and Bioimaging, Consiglio Nazionale delle Ricerche, Via Pietro Castellino, 111, 80131 Naples, Italy
| | - Simona Maria Monti
- Institute of Biostructures and Bioimaging, Consiglio Nazionale delle Ricerche, Via Pietro Castellino, 111, 80131 Naples, Italy
| | - Michael Smietana
- IBMM, Univ Montpellier, CNRS, ENSCM, 1919 route de Mende, 34293 Montpellier, cedex 5, France
| | - Giuseppina De Simone
- Institute of Biostructures and Bioimaging, Consiglio Nazionale delle Ricerche, Via Pietro Castellino, 111, 80131 Naples, Italy
| | - Claudiu T Supuran
- NEUROFARBA Department, Pharmaceutical and Nutraceutical Section, University of Florence, Via U. Schiff 6, 50019 Sesto Fiorentino, Firenze, Italy
| | - Paola Gratteri
- NEUROFARBA Department, Pharmaceutical and Nutraceutical Section, Laboratory of Molecular Modeling Cheminformatics & QSAR, University of Florence, Via U. Schiff 6, 50019 Sesto Fiorentino, Firenze, Italy
| | - Jean-Yves Winum
- IBMM, Univ Montpellier, CNRS, ENSCM, 1919 route de Mende, 34293 Montpellier, cedex 5, France
| |
Collapse
|
6
|
Romano GM, Savastano M, Bazzicalupi C, Chelli R, Lippolis V, Bencini A. Inorganic Anion Recognition in Aqueous Solution by Coupling Nearby Highly Hydrophilic and Hydrophobic Moieties in a Macrocyclic Receptor. Dalton Trans 2023; 52:6457-6472. [PMID: 37092684 DOI: 10.1039/d3dt00682d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/08/2023]
Abstract
Receptor L, composed by a tripropylen-tetraamine chain linking the 2 and 7 positions of an acridine unit via methylene bridges behaves as pentaprotic base in aqueous solution. The first four...
Collapse
Affiliation(s)
- Giammarco M Romano
- Dipartimento di Chimica 'Ugo Schiff', Università di Firenze, Via della Lastruccia 3, 50019, Sesto Fiorentino, Firenze, Italy.
| | - Matteo Savastano
- Dipartimento di Chimica 'Ugo Schiff', Università di Firenze, Via della Lastruccia 3, 50019, Sesto Fiorentino, Firenze, Italy.
| | - Carla Bazzicalupi
- Dipartimento di Chimica 'Ugo Schiff', Università di Firenze, Via della Lastruccia 3, 50019, Sesto Fiorentino, Firenze, Italy.
| | - Riccardo Chelli
- Dipartimento di Chimica 'Ugo Schiff', Università di Firenze, Via della Lastruccia 3, 50019, Sesto Fiorentino, Firenze, Italy.
| | - Vito Lippolis
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 Bivio per Sestu, 09042, Monserrato, Cagliari, Italy
| | - Andrea Bencini
- Dipartimento di Chimica 'Ugo Schiff', Università di Firenze, Via della Lastruccia 3, 50019, Sesto Fiorentino, Firenze, Italy.
| |
Collapse
|
7
|
Bazzicalupi C, Bonardi A, Biver T, Ferraroni M, Papi F, Savastano M, Lombardi P, Gratteri P. Probing the Efficiency of 13-Pyridylalkyl Berberine Derivatives to Human Telomeric G-Quadruplexes Binding: Spectroscopic, Solid State and In Silico Analysis. Int J Mol Sci 2022; 23:ijms232214061. [PMID: 36430540 PMCID: PMC9693123 DOI: 10.3390/ijms232214061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 11/09/2022] [Accepted: 11/11/2022] [Indexed: 11/16/2022] Open
Abstract
The interaction between the series of berberine derivatives 1-5 (NAX071, NAX120, NAX075, NAX077 and NAX079) and human telomeric G-quadruplexes (G4), which are able to inhibit the Telomerase enzyme's activity in malignant cells, was investigated. The derivatives bear a pyridine moiety connected by a hydrocarbon linker of varying length (n = 1-5, with n number of aliphatic carbon atoms) to the C13 position of the parent berberine. As for the G4s, both bimolecular 5'-TAGGGTTAGGGT-3' (Tel12) and monomolecular 5'-TAGGGTTAGGGTTAGGGTTAGGG-3' (Tel23) DNA oligonucleotides were considered. Spectrophotometric titrations, melting tests, X-ray diffraction solid state analysis and in silico molecular dynamics (MD) simulations were used to describe the different systems. The results were compared in search of structure-activity relationships. The analysis pointed out the formation of 1:1 complexes between Tel12 and all ligands, whereas both 1:1 and 2:1 ligand/G4 stoichiometries were found for the adduct formed by NAX071 (n = 1). Tel12, with tetrads free from the hindrance by the loop, showed a higher affinity. The details of the different binding geometries were discussed, highlighting the importance of H-bonds given by the berberine benzodioxole group and a correlation between the strength of binding and the hydrocarbon linker length. Theoretical (MD) and experimental (X-ray) structural studies evidence the possibility for the berberine core to interact with one or both G4 strands, depending on the constraints given by the linker length, thus affecting the G4 stabilization effect.
Collapse
Affiliation(s)
- Carla Bazzicalupi
- Department of Chemistry, University of Florence, Via della Lastruccia 3, 50019 Firenze, Italy
- Correspondence: (C.B.); (P.G.)
| | - Alessandro Bonardi
- Laboratory of Molecular Modeling Cheminformatics & QSAR, Department NEUROFARBA—Pharmaceutical and Nutraceutical Section, University of Firenze, Via Ugo Schiff 6, 50019 Firenze, Italy
| | - Tarita Biver
- Department of Chemistry and Industrial Chemistry, University of Pisa, Via G. Moruzzi 13, 56124 Pisa, Italy
| | - Marta Ferraroni
- Department of Chemistry, University of Florence, Via della Lastruccia 3, 50019 Firenze, Italy
| | - Francesco Papi
- Department of Chemistry, University of Florence, Via della Lastruccia 3, 50019 Firenze, Italy
- Laboratory of Molecular Modeling Cheminformatics & QSAR, Department NEUROFARBA—Pharmaceutical and Nutraceutical Section, University of Firenze, Via Ugo Schiff 6, 50019 Firenze, Italy
| | - Matteo Savastano
- Department of Chemistry, University of Florence, Via della Lastruccia 3, 50019 Firenze, Italy
| | - Paolo Lombardi
- Naxospharma srl, Via G. Di Vittorio 70, Novate Milanese, 20026 Milano, Italy
| | - Paola Gratteri
- Laboratory of Molecular Modeling Cheminformatics & QSAR, Department NEUROFARBA—Pharmaceutical and Nutraceutical Section, University of Firenze, Via Ugo Schiff 6, 50019 Firenze, Italy
- Correspondence: (C.B.); (P.G.)
| |
Collapse
|
8
|
Valbuena-Rus AM, Savastano M, Arranz-Mascarós P, Bazzicalupi C, Clares MP, Godino-Salido ML, Gutiérrez-Valero MD, Inclán M, Bianchi A, García-España E, López-Garzón R. Noncovalent Assembly and Catalytic Activity of Hybrid Materials Based on Pd Complexes Adsorbed on Multiwalled Carbon Nanotubes, Graphene, and Graphene Nanoplatelets. Inorg Chem 2022; 61:12610-12624. [PMID: 35926979 PMCID: PMC9387097 DOI: 10.1021/acs.inorgchem.2c01559] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
Green catalysts with excellent performance in Cu-free
Sonogashira
coupling reactions can be prepared by the supramolecular decoration
of graphene surfaces with Pd(II) complexes. Here we report the synthesis,
characterization, and catalytic properties of new catalysts obtained
by the surface decoration of multiwalled carbon nanotubes (MWCNTs),
graphene (G), and graphene nanoplatelets (GNPTs) with Pd(II) complexes
of tetraaza-macrocyclic ligands bearing one or two anchor functionalities.
The decoration of these carbon surfaces takes place under environmentally
friendly conditions (water, room temperature, aerobic) in two steps:
(i) π–π stacking attachment of the ligand via electron-poor
anchor group 6-amino-3,4-dihydro-3-methyl-5-nitroso-4-oxo-pyrimidine
and (ii) Pd(II) coordination from PdCl42–. Ligands are more efficiently adsorbed on the flat surfaces of G
and GNPTs than on the curved surfaces of MWCNTs. All catalysts work
very efficiently under mild conditions (50 °C, aerobic, 7 h),
giving a similar high yield (90% or greater) in the coupling of iodobenzene
with phenylacetylene to form diphenylacetylene in one catalytic cycle,
but catalysts based on G and GNPTs (especially on GNPTs) provide greater
catalytic efficiency in reuse (four cycles). The study also revealed
that the active centers of the ligand-Pd type decorating the support
surfaces are much more efficient than the Pd(0) and PdCl42– centers sharing the same surfaces. All of the
results allow a better understanding of the structural factors to
be controlled in order to obtain an optimal efficiency from similar
catalysts based on graphene supports. Green catalysts
with high efficiency in the Cu-free Sonogashira
C−C coupling reactions can be prepared by the supramolecular
functionalization of carbon materials.
Collapse
Affiliation(s)
- Alba M Valbuena-Rus
- Department of Inorganic and Organic Chemistry, University of Jaén, 23071 Jaen, Spain
| | - Matteo Savastano
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy.,National Interuniversity Consortium of Materials Science and Technology (INSTM), Via G. Giusti 9, 50121 Florence, Italy
| | | | - Carla Bazzicalupi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - María P Clares
- ICMol, Department of Inorganic Chemistry, University of Valencia, C/Catedrático José Beltrán 2, 46980 Paterna, Spain
| | - María L Godino-Salido
- Department of Inorganic and Organic Chemistry, University of Jaén, 23071 Jaen, Spain
| | | | - Mario Inclán
- ICMol, Department of Inorganic Chemistry, University of Valencia, C/Catedrático José Beltrán 2, 46980 Paterna, Spain
| | - Antonio Bianchi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Enrique García-España
- ICMol, Department of Inorganic Chemistry, University of Valencia, C/Catedrático José Beltrán 2, 46980 Paterna, Spain
| | - Rafael López-Garzón
- Department of Inorganic and Organic Chemistry, University of Jaén, 23071 Jaen, Spain
| |
Collapse
|
9
|
Cirri D, Bazzicalupi C, Ryde U, Bergmann J, Binacchi F, Nocentini A, Pratesi A, Gratteri P, Messori L. Computationally enhanced X-ray diffraction analysis of a gold(III) complex interacting with the human telomeric DNA G-quadruplex. Unravelling non-unique ligand positioning. Int J Biol Macromol 2022; 211:506-513. [PMID: 35561865 DOI: 10.1016/j.ijbiomac.2022.05.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 04/14/2022] [Accepted: 05/04/2022] [Indexed: 11/18/2022]
Abstract
The crystal structure of the human telomeric DNA Tel24 G-quadruplex (Tel24 = TAG3(T2AG3)3T) in complex with the novel [AuL] species (with L = 2,4,6-tris(2-pyrimidyl)-1,3,5-triazine - TPymT-α) was solved by a novel joint molecular mechanical (MM)/quantum mechanical (QM) innovative approach. The quantum-refinement crystallographic method (crystallographic refinement enhanced with quantum mechanical calculation) was adapted to treat the [AuL]/G-quadruplex structure, where each gold complex in the binding site was found spread over four equally occupied positions. The four positions were first determined by docking restrained to the crystallographically determined metal ions' coordinates. Then, the quantum refinement method was used to resolve the poorly defined density around the ligands and improve the crystallographic determination, revealing that the binding preferences of this metallodrug toward Tel24 G-quadruplex arise from a combined effect of pyrimidine stacking, metal-guanine interactions and charge-charge neutralizing action of the π-acid triazine. The occurrence of interaction in solution with the Tel24 G-quadruplex DNA was further proved through DNA melting experiments, which showed a slight destabilisation of the quadruplex upon adduct formation.
Collapse
Affiliation(s)
- Damiano Cirri
- Department of Chemistry and Industrial Chemistry, University of Pisa, Via G. Moruzzi 13, 56124 Pisa, Italy
| | - Carla Bazzicalupi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy.
| | - Ulf Ryde
- Division of Theoretical Chemistry, Lund University, Chemical Centre, P. O. Box 124, SE-221 00 Lund, Sweden.
| | - Justin Bergmann
- Division of Theoretical Chemistry, Lund University, Chemical Centre, P. O. Box 124, SE-221 00 Lund, Sweden
| | - Francesca Binacchi
- Department of Chemistry and Industrial Chemistry, University of Pisa, Via G. Moruzzi 13, 56124 Pisa, Italy
| | - Alessio Nocentini
- Department NEUROFARBA - Pharmaceutical and Nutraceutical Section and Laboratory of Molecular Modeling Cheminformatics & QSAR, University of Florence, Via U. Schiff 6, 50019, Sesto Fiorentino, Florence, Italy
| | - Alessandro Pratesi
- Department of Chemistry and Industrial Chemistry, University of Pisa, Via G. Moruzzi 13, 56124 Pisa, Italy
| | - Paola Gratteri
- Department NEUROFARBA - Pharmaceutical and Nutraceutical Section and Laboratory of Molecular Modeling Cheminformatics & QSAR, University of Florence, Via U. Schiff 6, 50019, Sesto Fiorentino, Florence, Italy.
| | - Luigi Messori
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| |
Collapse
|
10
|
Savastano M, Bazzicalupi C, Bianchi A. Novel cyclen-polyiodide complexes: a reappraisal of I-I covalent and secondary bond limits. Dalton Trans 2022; 51:10728-10739. [PMID: 35293413 DOI: 10.1039/d2dt00185c] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Supramolecular stabilization of polyiodides and iodine-dense phases is of high interest: this study explores the possibilities offered in this sense by diprotonated cyclen, affording two novel crystal structures. One of them contains at least one peculiar I⋯I interatomic distance (3.305(1) Å), falling well below the region commonly described by secondary bonding (3.4-3.7 Å) and essentially equal to the accepted limit for covalent bonding (3.30 Å): in other words, according to threshold distance values, we are relatively free to regard this interaction either as a bond or as contact. Lest the flip of a coin decides if we should or should not draw a bond in a polyiodide, statistical insights based on CSD surveys were used to put in perspective literature material and work out a meaningful assignment (as I82-). In doing so, we address how currently accepted threshold distance values came to be in the first place, their significance, soundness, and shortcomings in describing I82- and its formal fragments (I2, I3-, I5-). Discussion of the chemical meaning of the line representing bonding in I-I fragments in similar fringe cases, relating CSD data herein presented with the previous literature, is provided. Available information coincides quite well in supporting the necessity of a revision of broadly accepted threshold distance values.
Collapse
Affiliation(s)
- Matteo Savastano
- Department of Chemistry "Ugo Schiff", Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy.
| | - Carla Bazzicalupi
- Department of Chemistry "Ugo Schiff", Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy.
| | - Antonio Bianchi
- Department of Chemistry "Ugo Schiff", Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy.
| |
Collapse
|
11
|
Quiñone D, Veiga N, Savastano M, Torres J, Bianchi A, Kremer C, Bazzicalupi C. Supramolecular interaction of inositol phosphates with Cu(II): comparative study InsP6-InsP3. CrystEngComm 2022. [DOI: 10.1039/d1ce01733k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
myo-inositol phosphates are an important group of biomolecules that are present in all eukaryotic cells. The most abundant member of this family in nature is InsP6 (H12L1), which interacts strongly...
Collapse
|
12
|
Martínez-Camarena Á, Savastano M, Blasco S, Delgado-Pinar E, Giorgi C, Bianchi A, García-España E, Bazzicalupi C. Assembly of Polyiodide Networks with Cu(II) Complexes of Pyridinol-Based Tetraaza Macrocycles. Inorg Chem 2021; 61:368-383. [PMID: 34933551 PMCID: PMC8753606 DOI: 10.1021/acs.inorgchem.1c02967] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
Polyiodide networks
are currently of great practical interest for
the preparation of new electronic materials. The participation of
metals in the formation of these networks is believed to improve their
mechanical performance and thermal stability. Here we report the results
on the construction of polyiodide networks obtained using Cu(II) complexes
of a series of pyridinol-based tetraazacyclophanes as countercations.
The assembly of these crystalline polyiodides takes place from aqueous
solutions on the basis of similar structural elements, the [CuL]2+ and [Cu(H–1L)]+ (L = L2, L2-Me, L2-Me3) complex cations, so that the peculiarities induced by the
increase of N-methylation of ligands, the structural variable of ligands,
can be highlighted. First, solution equilibria involving ligands and
complexes were analyzed (potentiometry, NMR, UV–vis, ITC).
Then, the appropriate conditions could be selected to prepare polyiodides
based on the above complex cations. Single-crystal XRD analysis showed
that the coordination of pyridinol units to two metal ions is a prime
feature of these ligands, leading to polymeric coordination chains
of general formula {[Cu(H–1L)]}nn+ (L = L2-Me, L2-Me3). In the presence of the I–/I2 couple, the polymerization tendency
stops with the formation of [(CuL)(CuH–1L)]3+ (L = L2-Me, L2-Me3) dimers which are surrounded by polyiodide networks. Moreover,
coordination of the pyridinol group to two metal ions transforms the
surface charge of the ring from negative to markedly positive, generating
a suitable environment for the assembly of polyiodide anions, while
N-methylation shifts the directional control of the assembly from
H-bonds to I···I interactions. In fact, an extended
concatenation of iodine atoms occurs around the complex dimeric cations,
the supramolecular I···I interactions become shorter
and shorter, fading into stronger forces dominated by the orbital
overlap, which is promising for effective electronic materials. Polyiodides with high iodine density
are generated by Cu(II)
complexes of pyridinol-based tetraazacyclophanes. Direct coordination
of iodine atoms to Cu(II), anion−π interactions with
electron-poor aromatic surfaces, and shift of the directional control
of assembly from H-bonds to I···I interactions, governed
by N-methylation, are the main elements leading to enhanced iodine
chaining and strengthening of I···I contacts.
Collapse
Affiliation(s)
- Álvaro Martínez-Camarena
- ICMol, Department of Inorganic Chemistry, University of Valencia, C/Catedrático José Beltrán 2, 46980 Paterna, Spain
| | - Matteo Savastano
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Salvador Blasco
- ICMol, Department of Inorganic Chemistry, University of Valencia, C/Catedrático José Beltrán 2, 46980 Paterna, Spain
| | - Estefanía Delgado-Pinar
- ICMol, Department of Inorganic Chemistry, University of Valencia, C/Catedrático José Beltrán 2, 46980 Paterna, Spain.,Department of Chemistry, CQC, University of Coimbra, P3004-535 Coimbra, Portugal
| | - Claudia Giorgi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Antonio Bianchi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Enrique García-España
- ICMol, Department of Inorganic Chemistry, University of Valencia, C/Catedrático José Beltrán 2, 46980 Paterna, Spain
| | - Carla Bazzicalupi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| |
Collapse
|
13
|
Savastano M, Zoppi C, Bianchi A, Bazzicalupi C. Synthesis and coordination properties of a new ligand designed for surface functionalization of carbon substrates. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119793] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
14
|
Kremer C, Torres J, Bianchi A, Savastano M, Bazzicalupi C. myo-inositol hexakisphosphate: Coordinative versatility of a natural product. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213403] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
15
|
Papi F, Bazzicalupi C, Ferraroni M, Ciolli G, Lombardi P, Khan AY, Kumar GS, Gratteri P. Correction to "Pyridine Derivative of the Natural Alkaloid Berberine as Human Telomeric G 4-DNA Binder: A Solution and Solid-State Study". ACS Med Chem Lett 2020; 11:1490. [PMID: 32676159 DOI: 10.1021/acsmedchemlett.0c00309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
[This corrects the article DOI: 10.1021/acsmedchemlett.9b00516.].
Collapse
|
16
|
Picci G, Bazzicalupi C, Coles SJ, Gratteri P, Isaia F, Lippolis V, Montis R, Murgia S, Nocentini A, Orton JB, Caltagirone C. Halogenated isophthalamides and dipicolineamides: the role of the halogen substituents in the anion binding properties. Dalton Trans 2020; 49:9231-9238. [PMID: 32500883 DOI: 10.1039/d0dt01492c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A novel family of amide-based receptors is herein described. Specifically, the role of the halogen substituents at the aryl moieties in the anion binding properties of a series of halogenated isophthalamides and dipicolineamides (L1-L6) was investigated both in solution and in the solid state in order to evaluate the incidence of all possible different and combined weak host-guest interactions. Only L5 and L6 bearing pentafluorophenyl rings as substituents have some affinities for the set of anions studied. In particular, in the case of L5 an interesting behaviour with the formation of a non-symmetric adduct with benzoate and dihydrogen phosphate was hypothesised by 1H- and 19F-NMR spectroscopy studies in solution and confirmed by theoretical calculation. The study of the crystal structures of the receptors demonstrated that the steric hindrance determined by the halogen substituents in the receptor molecules influences the accessibility of the anions to the isophthalamide or dipicoline amide NH moieties, thus modulating the affinity for the anion guests.
Collapse
Affiliation(s)
- Giacomo Picci
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 Bivio per Sestu, 09042 Monserrato (CA), Italy.
| | - Carla Bazzicalupi
- Dipartimento di Chimica 'Ugo Schiff', Via della Lastruccia, 3-13 50019 Sesto Fiorentino (FI), Italy
| | - Simon J Coles
- Chemistry University of Southampton, Highfield, Southampton SO17 1BJ, UK
| | - Paola Gratteri
- Department of NEUROFARBA, Section of Pharmaceutical and Nutraceutical Sciences, Laboratory of Molecular Modeling Cheminformatics & QSAR, University of Florence, Polo Scientifico, Via U. Schiff 6, 50019 Sesto Fiorentino, Firenze, Italy
| | - Francesco Isaia
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 Bivio per Sestu, 09042 Monserrato (CA), Italy.
| | - Vito Lippolis
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 Bivio per Sestu, 09042 Monserrato (CA), Italy.
| | - Riccardo Montis
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 Bivio per Sestu, 09042 Monserrato (CA), Italy.
| | - Sergio Murgia
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 Bivio per Sestu, 09042 Monserrato (CA), Italy.
| | - Alessio Nocentini
- Department of NEUROFARBA, Section of Pharmaceutical and Nutraceutical Sciences, Laboratory of Molecular Modeling Cheminformatics & QSAR, University of Florence, Polo Scientifico, Via U. Schiff 6, 50019 Sesto Fiorentino, Firenze, Italy
| | - James B Orton
- Chemistry University of Southampton, Highfield, Southampton SO17 1BJ, UK
| | - Claudia Caltagirone
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 Bivio per Sestu, 09042 Monserrato (CA), Italy.
| |
Collapse
|
17
|
Savastano M, Bazzicalupi C, Bianchi A. Cover Feature: Porous Frameworks Based on Supramolecular Ball Joints: Bringing Flexibility to Ordered 3D Lattices (Chem. Eur. J. 27/2020). Chemistry 2020. [DOI: 10.1002/chem.202001593] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Matteo Savastano
- Dept. of Chemistry “Ugo Schiff”University of Florence via della Lastruccia 3–13 50019 Sesto Fiorentino Italy
| | - Carla Bazzicalupi
- Dept. of Chemistry “Ugo Schiff”University of Florence via della Lastruccia 3–13 50019 Sesto Fiorentino Italy
| | - Antonio Bianchi
- Dept. of Chemistry “Ugo Schiff”University of Florence via della Lastruccia 3–13 50019 Sesto Fiorentino Italy
| |
Collapse
|
18
|
Savastano M, Bazzicalupi C, Bianchi A. Porous Frameworks Based on Supramolecular Ball Joints: Bringing Flexibility to Ordered 3D Lattices. Chemistry 2020; 26:5994-6005. [PMID: 32150318 DOI: 10.1002/chem.202000505] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 03/02/2020] [Indexed: 01/30/2023]
Abstract
XOFs-type materials (X=M, C, S, that is, metal-organic frameworks, covalent organic frameworks and supramolecular organic frameworks, respectively) share a common unifying feature: mutual spatial orientation of constituting components is strictly directional and unchanging by design. Herein, we illustrate an alternate design for porous architectures, as rigid joints constituted by coordinative (MOFs), covalent (COFs), or hydrogen-donor/acceptor (SOFs) bonds, are replaced by supramolecular ball joints, which confer unprecedented flexibility, especially angular, to porous networks. The obtained frameworks remain highly organized but are also permutable: lacking a forced convergence towards an immutable minimum energy structure, these systems remain able to adjust depending on external conditions. Results of POF (permutable organized framework) synthesis is a family of structures rather than a single pre-determined three-dimensional arrangement, as we demonstrate with an illustrative set of 5 XRD structures.
Collapse
Affiliation(s)
- Matteo Savastano
- Dept. of Chemistry "Ugo Schiff", University of Florence, via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy
| | - Carla Bazzicalupi
- Dept. of Chemistry "Ugo Schiff", University of Florence, via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy
| | - Antonio Bianchi
- Dept. of Chemistry "Ugo Schiff", University of Florence, via della Lastruccia 3-13, 50019, Sesto Fiorentino, Italy
| |
Collapse
|
19
|
Savastano M, Fiaschi M, Ferraro G, Gratteri P, Mariani P, Bianchi A, Bazzicalupi C. Sensing Zn 2+ in Aqueous Solution with a Fluorescent Scorpiand Macrocyclic Ligand Decorated with an Anthracene Bearing Tail. Molecules 2020; 25:E1355. [PMID: 32192025 PMCID: PMC7146481 DOI: 10.3390/molecules25061355] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 03/13/2020] [Accepted: 03/15/2020] [Indexed: 01/16/2023] Open
Abstract
Synthesis of the new scorpiand ligand L composed of a [9]aneN3 macrocyclic ring bearing a CH2CH2NHCH2-anthracene tail is reported. L forms both cation (Zn2+) and anion (phosphate, benzoate) complexes. In addition, the zinc complexes of L bind these anions. The equilibrium constants for ligand protonation and complex formation were determined in 0.1 M NaCl aqueous solution at 298.1 ± 0.1 K by means of potentiometric (pH-metric) titrations. pH Controlled coordination/detachment of the ligand tail to Zn2+ switch on and off the fluorescence emission from the anthracene fluorophore. Accordingly, L is able to sense Zn2+ in the pH range 6-10 down to nM concentrations of the metal ion. L can efficiently sense Zn2+ even in the presence of large excess of coordinating anions, such as cyanide, sulphide, phosphate and benzoate, despite their ability to bind the metal ion.
Collapse
Affiliation(s)
- Matteo Savastano
- Department of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Italy; (M.S.); (M.F.); (G.F.); (P.M.); (C.B.)
| | - Matteo Fiaschi
- Department of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Italy; (M.S.); (M.F.); (G.F.); (P.M.); (C.B.)
| | - Giovanni Ferraro
- Department of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Italy; (M.S.); (M.F.); (G.F.); (P.M.); (C.B.)
| | - Paola Gratteri
- Department of NEUROFARBA-Pharmaceutical and Nutraceutical section, and Laboratory of Molecular Modeling Cheminformatics & QSAR, University of Florence, Via Ugo Schiff 6, 50019 Sesto Fiorentino, Italy;
| | - Palma Mariani
- Department of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Italy; (M.S.); (M.F.); (G.F.); (P.M.); (C.B.)
| | - Antonio Bianchi
- Department of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Italy; (M.S.); (M.F.); (G.F.); (P.M.); (C.B.)
| | - Carla Bazzicalupi
- Department of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Italy; (M.S.); (M.F.); (G.F.); (P.M.); (C.B.)
| |
Collapse
|
20
|
Papi F, Bazzicalupi C, Ferraroni M, Ciolli G, Lombardi P, Khan AY, Kumar GS, Gratteri P. Pyridine Derivative of the Natural Alkaloid Berberine as Human Telomeric G 4-DNA Binder: A Solution and Solid-State Study. ACS Med Chem Lett 2020; 11:645-650. [PMID: 32435365 DOI: 10.1021/acsmedchemlett.9b00516] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Accepted: 02/07/2020] [Indexed: 12/18/2022] Open
Abstract
Telomerase is an enzyme deputed to the maintenance of eukaryotic chromosomes; however, its overexpression is a recognized hallmark of many cancer forms. A viable route for the inhibition of telomerase in malignant cells is the stabilization of G-quadruplex structures (G4) at the 3' overhang of telomeres. Berberine has shown in this regard valuable G4 binding properties together with a significant anticancer activity and telomerase inhibition effects. Here, we focused on a berberine derivative featuring a pyridine containing side group at the 13th position. Such modification actually improves the binding toward telomeric G-quadruplexes and establishes a degree of selectivity in the interaction with different sequences. Moreover, the X-ray crystal structure obtained for the complex formed by the ligand and a bimolecular human telomeric quadruplex affords a better understanding of the 13-berberine derivatives behavior with telomeric G4 and allows to draw useful insights for the future design of derivatives with remarkable anticancer properties.
Collapse
Affiliation(s)
- Francesco Papi
- Department of Chemistry ’Ugo Schiff’, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino (FI), Italy
| | - Carla Bazzicalupi
- Department of Chemistry ’Ugo Schiff’, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino (FI), Italy
| | - Marta Ferraroni
- Department of Chemistry ’Ugo Schiff’, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino (FI), Italy
| | - Giulia Ciolli
- Department of Chemistry ’Ugo Schiff’, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino (FI), Italy
| | - Paolo Lombardi
- Naxospharma srl, Via G. Di Vittorio 70, 20026 Novate Milanese (MI), Italy
| | - Asma Yasmeen Khan
- Biophysical Chemistry Laboratory, CSIR-Indian Institute of Chemical Biology, Kolkata 700 032, India
| | - Gopinatha Suresh Kumar
- Biophysical Chemistry Laboratory, CSIR-Indian Institute of Chemical Biology, Kolkata 700 032, India
| | - Paola Gratteri
- Department NEUROFARBA − Pharmaceutical and Nutraceutical Section and Laboratory of Molecular Modeling Cheminformatics & QSAR, University of Florence, Via U. Schiff 6, 50019 Sesto Fiorentino, Florence, Italy
| |
Collapse
|
21
|
Quiñone D, Martínez S, Bozoglián F, Bazzicalupi C, Torres J, Veiga N, Bianchi A, Kremer C. Solution Studies and Crystal Structures of Heteropolynuclear Potassium/Copper Complexes with Phytate and Aromatic Polyamines: Self-Assembly through Coordinative and Supramolecular Interactions. Chempluschem 2020; 84:540-552. [PMID: 31943896 DOI: 10.1002/cplu.201900141] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Revised: 04/25/2019] [Indexed: 02/03/2023]
Abstract
Phytate (L12- ) is a relevant natural product. It interacts strongly with biologically relevant cations, due to the high negative charge exhibited in a wide pH range. The synthesis and crystal structures of the mixed-ligand Cu(II) polynuclear complexes K(H2 tptz)0.5 [Cu(H8 L)(tptz)] ⋅ 3.6H2 O (1), K(H2 O)3 {[Cu(H2 O)(bpca)]3 (H8 L)} ⋅ 1.75H2 O (2), and K1.5 (H2 O)2 [Cu(bpca)](H9.5 L) ⋅ 8H2 O (3) (tptz=2,4,6-tri(pyridin-2-yl)-1,3,5-triazine; Hbpca=bis(2-pyridylcarbonyl) amine) are reported herein. They were obtained by the use of an aromatic rigid amine, which satisfies some of the metal coordination sites and promotes the hierarchical assembly of 2D polymeric structures. Speciation of phytate-Cu(II)-Hbpca system and determination of complex stability constants were performed by means of potentiometric titrations, in 0.15 M NMe4 Cl at 37.0 °C, showing that, even in solution, this system is able to produce highly aggregated complexes, such as [Cu3 (bpca)3 (H7 L)]2- . Furthermore, the Cu(II)-mediated tptz hydrolysis was studied by UV-vis spectroscopy at room temperature in 0.15 M NMe4 Cl. Based on the equilibrium results and with the aid of molecular modelling tools, a plausible self-assembly process for 2 and 3 could be proposed.
Collapse
Affiliation(s)
- Delfina Quiñone
- Facultad de Química, Universidad de la República, Avenida Gral. Flores 2124, 11800, Montevideo, Uruguay
| | - Sebastián Martínez
- Facultad de Química, Universidad de la República, Avenida Gral. Flores 2124, 11800, Montevideo, Uruguay
| | - Fernando Bozoglián
- Institut Català d'Investigació Química, 16, Avinguda dels Països Catalans, 43007, Tarragona, Spain
| | - Carla Bazzicalupi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia, 3, 50019, Sesto Fiorentino, Italy
| | - Julia Torres
- Facultad de Química, Universidad de la República, Avenida Gral. Flores 2124, 11800, Montevideo, Uruguay
| | - Nicolás Veiga
- Facultad de Química, Universidad de la República, Avenida Gral. Flores 2124, 11800, Montevideo, Uruguay
| | - Antonio Bianchi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia, 3, 50019, Sesto Fiorentino, Italy
| | - Carlos Kremer
- Facultad de Química, Universidad de la República, Avenida Gral. Flores 2124, 11800, Montevideo, Uruguay
| |
Collapse
|
22
|
Martínez-Camarena Á, Savastano M, Llinares JM, Verdejo B, Bianchi A, García-España E, Bazzicalupi C. Stabilization of polyiodide networks with Cu(ii) complexes of small methylated polyazacyclophanes: shifting directional control from H-bonds to I⋯I interactions. Inorg Chem Front 2020. [DOI: 10.1039/d0qi00912a] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Modulation of hydrogen bonds and iodine–iodine interactions, both covalent and supramolecular, unlocks novel possibilities for the construction of transition metal-polyiodide hybrid networks.
Collapse
Affiliation(s)
| | - Matteo Savastano
- Department of Chemistry “Ugo Schiff”
- University of Florence
- 50019 Sesto Fiorentino
- Italy
| | - José M. Llinares
- ICMol
- Department of Organic Chemistry
- University of Valencia
- Paterna
- Spain
| | - Begoña Verdejo
- ICMol
- Department of Inorganic Chemistry
- University of Valencia
- Paterna
- Spain
| | - Antonio Bianchi
- Department of Chemistry “Ugo Schiff”
- University of Florence
- 50019 Sesto Fiorentino
- Italy
| | | | - Carla Bazzicalupi
- Department of Chemistry “Ugo Schiff”
- University of Florence
- 50019 Sesto Fiorentino
- Italy
| |
Collapse
|
23
|
Savastano M, Bazzicalupi C, Gellini C, Bianchi A. Infinite supramolecular pseudo-polyrotaxane with poly[3]catenane axle: assembling nanosized rings from mono- and diatomic I - and I 2 tectons. Chem Commun (Camb) 2019; 56:551-554. [PMID: 31829344 DOI: 10.1039/c9cc08367g] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Mono- and diatomic I- and I2 building blocks, despite their simplicity, can be used to generate complex hierarchical self-assembled architectures. Herein, the construction of a modular supramolecular poly[3]catenane and its conversion into the axle of an infinite supramolecular pseudo-polyrotaxane were achieved in a seamless process from the starting materials. The unique structural features, directionality, and iodine density of the obtained crystals demonstrate the benefits of a supramolecular design for polyiodide networks intended as solid-state conductors.
Collapse
Affiliation(s)
- Matteo Savastano
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino (FI), Italy.
| | - Carla Bazzicalupi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino (FI), Italy.
| | - Cristina Gellini
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino (FI), Italy.
| | - Antonio Bianchi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino (FI), Italy.
| |
Collapse
|
24
|
Savastano M, García-Gallarín C, López de la Torre MD, Bazzicalupi C, Bianchi A, Melguizo M. Anion-π and lone pair-π interactions with s-tetrazine-based ligands. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.06.016] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
|
25
|
Savastano M, García-Gallarín C, Giorgi C, Gratteri P, López de la Torre MD, Bazzicalupi C, Bianchi A, Melguizo M. Solid State and Solution Study on the Formation of Inorganic Anion Complexes with a Series of Tetrazine-Based Ligands. Molecules 2019; 24:E2247. [PMID: 31208109 PMCID: PMC6631435 DOI: 10.3390/molecules24122247] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 06/13/2019] [Accepted: 06/14/2019] [Indexed: 12/18/2022] Open
Abstract
Four molecules (L1-L4) constituted by an s-tetrazine ring appended with two identical aliphatic chains of increasing length bearing terminal morpholine groups were studied as anion receptors in water. The basicity properties of these molecules were also investigated. Speciation of the anion complexes formed in solution and determination of their stability constants were performed by means of potentiometric (pH-metric) titrations, while further information was obtained by NMR and isothermal titration calorimetry (ITC) measurements. The crystal structures of two neutral ligands (L3, L4) and of their H2L3(ClO4)2∙2H2O, H2L4(ClO4)2∙2H2O, H2L3(PF6)2, and H2L3(PF6)2∙2H2O anion complexes were determined by single crystal X-ray diffraction. The formation of anion-π interactions is the leitmotiv of these complexes, both in solution and in the solid state, although hydrogen bonding and/or formation of salt-bridges can contribute to their stability. Evidence of the ability of these ligands to form anion-π interactions is given by the observation that even the neutral (not-protonated) molecules bind anions in water to form complexes of significant stability, including elusive OH- anions.
Collapse
Affiliation(s)
- Matteo Savastano
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Italy.
| | | | - Claudia Giorgi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Italy.
| | - Paola Gratteri
- Department of NEUROFARBA-Pharmaceutical and Nutraceutical Section, and Laboratory of Molecular Modeling Cheminformatics & QSAR, University of Florence, Via Ugo Schiff 6, 50019 Sesto Fiorentino, Italy.
| | | | - Carla Bazzicalupi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Italy.
| | - Antonio Bianchi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Italy.
| | - Manuel Melguizo
- Department of Inorganic and Organic Chemistry, University of Jaén, 23071 Jaén, Spain.
| |
Collapse
|
26
|
Savastano M, Bazzicalupi C, Ferraro G, Fratini E, Gratteri P, Bianchi A. Tales of the Unexpected: The Case of Zirconium(IV) Complexes with Desferrioxamine. Molecules 2019; 24:molecules24112098. [PMID: 31159506 PMCID: PMC6600682 DOI: 10.3390/molecules24112098] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 05/30/2019] [Accepted: 05/31/2019] [Indexed: 11/25/2022] Open
Abstract
The Zr4+ complexes with desferrioxamine (H3DFO) and its derivatives are the only 89Zr-based imaging agents for proton emission tomography (PET) that have been used so far in clinical trials. Nevertheless, a complete speciation of the Zr4+/H3DFO system in solution has never been performed and the stability constants of the relevant complexes are still unknown. Here we report, for the first time, the speciation of this system in water, performed by potentiometric titrations, and the determination of the stability constants of all complexes formed in the pH range 2.5–11.5. Surprisingly, although desferrioxamine gives rise to very stable 1:1 complexes with Zr4+ (logK = 36.14 for Zr4+ + DFO3− = [ZrDFO]+), 2:2 and 2:3 ones are also formed in solution. Depending on the conditions, these binuclear complexes can be main species in solution. These results were corroborated by small-angle X-ray scattering (SAXS) and MALDI mass spectrometry analyses of complex solutions. Information on complex structures was obtained by means of density functional theory (DFT) calculations.
Collapse
Affiliation(s)
- Matteo Savastano
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Italy.
| | - Carla Bazzicalupi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Italy.
| | - Giovanni Ferraro
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Italy.
- Consorzio per lo Sviluppo dei Sistemi a Grande Interfase (CSGI), University of Florence, Via della Lastruccia, 3 50019 Sesto Fiorentino, Italy.
| | - Emiliano Fratini
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Italy.
- Consorzio per lo Sviluppo dei Sistemi a Grande Interfase (CSGI), University of Florence, Via della Lastruccia, 3 50019 Sesto Fiorentino, Italy.
| | - Paola Gratteri
- Department of NEUROFARBA- Pharmaceutical and Nutraceutical section, and Laboratory of Molecular Modeling Cheminformatics & QSAR, University of Florence, Via Ugo Schiff 6, 50019 Sesto Fiorentino, Italy.
| | - Antonio Bianchi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Italy.
| |
Collapse
|
27
|
van Rixel VHS, Busemann A, Wissingh MF, Hopkins SL, Siewert B, van de Griend C, Siegler MA, Marzo T, Papi F, Ferraroni M, Gratteri P, Bazzicalupi C, Messori L, Bonnet S. Induction of a Four‐Way Junction Structure in the DNA Palindromic Hexanucleotide 5′‐d(CGTACG)‐3′ by a Mononuclear Platinum Complex. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201814532] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Vincent H. S. van Rixel
- Leiden Institute of ChemistryLeiden University Einsteinweg 55, PO Box 9502 2333CC Leiden The Netherlands
| | - Anja Busemann
- Leiden Institute of ChemistryLeiden University Einsteinweg 55, PO Box 9502 2333CC Leiden The Netherlands
| | - Mathijs F. Wissingh
- Leiden Institute of ChemistryLeiden University Einsteinweg 55, PO Box 9502 2333CC Leiden The Netherlands
| | - Samantha L. Hopkins
- Leiden Institute of ChemistryLeiden University Einsteinweg 55, PO Box 9502 2333CC Leiden The Netherlands
| | - Bianka Siewert
- Leiden Institute of ChemistryLeiden University Einsteinweg 55, PO Box 9502 2333CC Leiden The Netherlands
| | - Corjan van de Griend
- Leiden Institute of ChemistryLeiden University Einsteinweg 55, PO Box 9502 2333CC Leiden The Netherlands
| | | | - Tiziano Marzo
- Department of PharmacyUniversity of Pisa Via Bonanno Pisano 6 56126 Pisa Italy
| | - Francesco Papi
- Department of ChemistryUniversity of Florence Via della Lastruccia 3 50019 Sesto Fiorentino (FI) Italy
| | - Marta Ferraroni
- Department of ChemistryUniversity of Florence Via della Lastruccia 3 50019 Sesto Fiorentino (FI) Italy
| | - Paola Gratteri
- Department NEUROFARBA—Pharmaceutical and Nutraceutical sectionLaboratory of Molecular Modeling Cheminformatics and QSARUniversity of Florence Via Ugo Schiff 6 50019 Sesto Fiorentino (FI) Italy
| | - Carla Bazzicalupi
- Department of ChemistryUniversity of Florence Via della Lastruccia 3 50019 Sesto Fiorentino (FI) Italy
| | - Luigi Messori
- Department of Chemistry “Ugo Schiff”University of Florence Italy
| | - Sylvestre Bonnet
- Leiden Institute of ChemistryLeiden University Einsteinweg 55, PO Box 9502 2333CC Leiden The Netherlands
| |
Collapse
|
28
|
van Rixel VHS, Busemann A, Wissingh MF, Hopkins SL, Siewert B, van de Griend C, Siegler MA, Marzo T, Papi F, Ferraroni M, Gratteri P, Bazzicalupi C, Messori L, Bonnet S. Induction of a Four-Way Junction Structure in the DNA Palindromic Hexanucleotide 5'-d(CGTACG)-3' by a Mononuclear Platinum Complex. Angew Chem Int Ed Engl 2019; 58:9378-9382. [PMID: 31046177 PMCID: PMC6618160 DOI: 10.1002/anie.201814532] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Indexed: 12/22/2022]
Abstract
Four-way junctions (4WJs) are supramolecular DNA assemblies comprising four interacting DNA strands that in biology are involved in DNA-damage repair. In this study, a new mononuclear platinum(II) complex 1 was prepared that is capable of driving the crystallization of the DNA oligomer 5'-d(CGTACG)-3' specifically into a 4WJ-like motif. In the crystal structure of the 1-CGTACG adduct, the distorted-square-planar platinum complex binds to the core of the 4WJ-like motif through π-π stacking and hydrogen bonding, without forming any platinum-nitrogen coordination bonds. Our observations suggest that the specific molecular properties of the metal complex are crucially responsible for triggering the selective assembly of this peculiar DNA superstructure.
Collapse
Affiliation(s)
- Vincent H S van Rixel
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, PO Box 9502, 2333CC, Leiden, The Netherlands
| | - Anja Busemann
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, PO Box 9502, 2333CC, Leiden, The Netherlands
| | - Mathijs F Wissingh
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, PO Box 9502, 2333CC, Leiden, The Netherlands
| | - Samantha L Hopkins
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, PO Box 9502, 2333CC, Leiden, The Netherlands
| | - Bianka Siewert
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, PO Box 9502, 2333CC, Leiden, The Netherlands
| | - Corjan van de Griend
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, PO Box 9502, 2333CC, Leiden, The Netherlands
| | | | - Tiziano Marzo
- Department of Pharmacy, University of Pisa, Via Bonanno Pisano 6, 56126, Pisa, Italy
| | - Francesco Papi
- Department of Chemistry, University of Florence, Via della Lastruccia 3, 50019, Sesto Fiorentino (FI), Italy
| | - Marta Ferraroni
- Department of Chemistry, University of Florence, Via della Lastruccia 3, 50019, Sesto Fiorentino (FI), Italy
| | - Paola Gratteri
- Department NEUROFARBA-Pharmaceutical and Nutraceutical section, Laboratory of Molecular Modeling Cheminformatics and QSAR, University of Florence, Via Ugo Schiff 6, 50019, Sesto Fiorentino (FI), Italy
| | - Carla Bazzicalupi
- Department of Chemistry, University of Florence, Via della Lastruccia 3, 50019, Sesto Fiorentino (FI), Italy
| | - Luigi Messori
- Department of Chemistry "Ugo Schiff", University of Florence, Italy
| | - Sylvestre Bonnet
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, PO Box 9502, 2333CC, Leiden, The Netherlands
| |
Collapse
|
29
|
Papi F, Kenđel A, Ratkaj M, Piantanida I, Gratteri P, Bazzicalupi C, Miljanić S. Effect of structure levels on surface-enhanced Raman scattering of human telomeric G-quadruplexes in diluted and crowded media. Anal Bioanal Chem 2019; 411:5197-5207. [PMID: 31119345 DOI: 10.1007/s00216-019-01894-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Revised: 04/26/2019] [Accepted: 05/06/2019] [Indexed: 10/26/2022]
Abstract
Human telomeric G-quadruplexes are emerging targets in anticancer drug discovery since they are able to efficiently inhibit telomerase, an enzyme which is greatly involved in telomere instability and immortalization process in malignant cells. G-quadruplex (G4) DNA is highly polymorphic and can adopt different topologies upon addition of electrolytes, additives, and ligands. The study of G-quadruplex forms under various conditions, however, might be quite challenging. In this work, surface-enhanced Raman scattering (SERS) spectroscopy has been applied to study G-quadruplexes formed by human telomeric sequences, d[A3G3(TTAGGG)3A2] (Tel26) and d[(TTAGGG)4T2] (wtTel26), under dilute and crowding conditions. The SERS spectra distinctive of hybrid-1 and hybrid-2 G-quadruplexes of Tel26 and wtTel26, respectively, were observed for the sequences folded in the presence of K+ ions (110 mM) in a buffered solution, representing the diluted medium. Polyethylene glycol (5, 10, 15, 20, and 40% v/v PEG) was used to create a molecular-crowded environment, resulting in the formation of the parallel G-quadruplexes of both studied human telomeric sequences. Despite extensive overlap by the crowding agent bands, the SERS spectral features indicative of parallel G4 form of Tel26 were recognized. The obtained results implied that SERS of G-quadruplexes reflected not only the primary structure of the studied human telomeric sequence, including its nucleobase composition and sequence, but also its secondary structure in the sense of Hoogsteen hydrogen bonds responsible for the guanine tetrad formation, and finally its tertiary structure, defining a three-dimensional DNA shape, positioned close to the enhancing metallic surface. Graphical abstract.
Collapse
Affiliation(s)
- Francesco Papi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Florence, Italy. .,Department NEUROFARBA - Pharmaceutical and Nutraceutical Section, Laboratory of Molecular Modeling Cheminformatics & QSAR, University of Florence, Via Ugo Schiff 6, 50019 Sesto Fiorentino, Florence, Italy.
| | - Adriana Kenđel
- Division of Analytical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000, Zagreb, Croatia
| | - Marina Ratkaj
- Teva Pharmaceutical Industries Ltd., Research and Development, PLIVA Croatia, Prilaz baruna Filipovića 29, 10000, Zagreb, Croatia
| | - Ivo Piantanida
- Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10002, Zagreb, Croatia
| | - Paola Gratteri
- Department NEUROFARBA - Pharmaceutical and Nutraceutical Section, Laboratory of Molecular Modeling Cheminformatics & QSAR, University of Florence, Via Ugo Schiff 6, 50019 Sesto Fiorentino, Florence, Italy
| | - Carla Bazzicalupi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Florence, Italy
| | - Snežana Miljanić
- Division of Analytical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000, Zagreb, Croatia.
| |
Collapse
|
30
|
Manetti D, Garifulina A, Bartolucci G, Bazzicalupi C, Bellucci C, Chiaramonte N, Dei S, Di Cesare Mannelli L, Ghelardini C, Gratteri P, Spirova E, Shelukhina I, Teodori E, Varani K, Tsetlin V, Romanelli MN. New Rigid Nicotine Analogues, Carrying a Norbornane Moiety, Are Potent Agonists of α7 and α3* Nicotinic Receptors. J Med Chem 2019; 62:1887-1901. [PMID: 30681854 DOI: 10.1021/acs.jmedchem.8b01372] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A three-dimensional database search has been applied to design a series of endo- and exo-3-(pyridin-3-yl)bicyclo[2.2.1]heptan-2-amines as nicotinic receptor ligands. The synthesized compounds were tested in radioligand binding assay on rat cortex against [3H]-cytisine and [3H]-methyllycaconitine to measure their affinity for α4β2* and α7* nicotinic receptors. The new derivatives showed some preference for the α4β2* over the α7* subtype, with their affinity being dependent on the endo/exo isomerism and on the methylation degree of the basic nitrogen. The endo primary amines displayed the lowest Ki values on both receptor subtypes. Selected compounds (1a, 2a, 3a, and 6a) were tested on heterologously expressed α4β2, α7, and α3β2 receptors and on SHSY-5Y cells. Compounds 1a and 2a showed α4β2 antagonistic properties while behaved as full agonists on recombinant α7 and on SHSY5Y cells. On the α3β2 subtype, only the chloro derivative 2a showed full agonist activity and submicromolar potency (EC50 = 0.43 μM). The primary amines described here represent new chemotypes for the α7 and α3* receptor subtypes.
Collapse
Affiliation(s)
- Dina Manetti
- Department of Neuroscience, Psychology, Drug Research and Child's Health (NEUROFARBA), Section of Pharmaceutical and Nutraceutical Sciences , University of Florence , Via Ugo Schiff 6 , 50019 Sesto Fiorentino , Italy
| | - Alexandra Garifulina
- Department of Molecular Basis of Neurosignaling, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry , Russian Academy of Sciences , Miklukho-Maklaya Street 16/10 , 117997 Moscow , Russia
| | - Gianluca Bartolucci
- Department of Neuroscience, Psychology, Drug Research and Child's Health (NEUROFARBA), Section of Pharmaceutical and Nutraceutical Sciences , University of Florence , Via Ugo Schiff 6 , 50019 Sesto Fiorentino , Italy
| | - Carla Bazzicalupi
- Department of Chemistry "Ugo Schiff" , University of Florence , Via della Lastruccia 3 , 50019 Sesto Fiorentino , Italy
| | - Cristina Bellucci
- Department of Neuroscience, Psychology, Drug Research and Child's Health (NEUROFARBA), Section of Pharmaceutical and Nutraceutical Sciences , University of Florence , Via Ugo Schiff 6 , 50019 Sesto Fiorentino , Italy
| | - Niccolò Chiaramonte
- Department of Neuroscience, Psychology, Drug Research and Child's Health (NEUROFARBA), Section of Pharmaceutical and Nutraceutical Sciences , University of Florence , Via Ugo Schiff 6 , 50019 Sesto Fiorentino , Italy
| | - Silvia Dei
- Department of Neuroscience, Psychology, Drug Research and Child's Health (NEUROFARBA), Section of Pharmaceutical and Nutraceutical Sciences , University of Florence , Via Ugo Schiff 6 , 50019 Sesto Fiorentino , Italy
| | - Lorenzo Di Cesare Mannelli
- Department of NEUROFARBA, Section of Pharmacology and Toxicology , University of Florence , Viale G Pieraccini 6 , 50139 Firenze , Italy
| | - Carla Ghelardini
- Department of NEUROFARBA, Section of Pharmacology and Toxicology , University of Florence , Viale G Pieraccini 6 , 50139 Firenze , Italy
| | - Paola Gratteri
- Department of NEUROFARBA, Laboratory of Molecular Modeling Cheminformatics & QSAR , University of Firenze , Via Ugo Schiff 6 , 50019 Sesto Fiorentino , Italy
| | - Ekaterina Spirova
- Department of Molecular Basis of Neurosignaling, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry , Russian Academy of Sciences , Miklukho-Maklaya Street 16/10 , 117997 Moscow , Russia
| | - Irina Shelukhina
- Department of Molecular Basis of Neurosignaling, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry , Russian Academy of Sciences , Miklukho-Maklaya Street 16/10 , 117997 Moscow , Russia
| | - Elisabetta Teodori
- Department of Neuroscience, Psychology, Drug Research and Child's Health (NEUROFARBA), Section of Pharmaceutical and Nutraceutical Sciences , University of Florence , Via Ugo Schiff 6 , 50019 Sesto Fiorentino , Italy
| | - Katia Varani
- Institute of Pharmacology , University of Ferrara , Via Fossato di Mortara 17-19 , 44100 Ferrara , Italy
| | - Victor Tsetlin
- Department of Molecular Basis of Neurosignaling, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry , Russian Academy of Sciences , Miklukho-Maklaya Street 16/10 , 117997 Moscow , Russia
| | - Maria Novella Romanelli
- Department of Neuroscience, Psychology, Drug Research and Child's Health (NEUROFARBA), Section of Pharmaceutical and Nutraceutical Sciences , University of Florence , Via Ugo Schiff 6 , 50019 Sesto Fiorentino , Italy
| |
Collapse
|
31
|
Savastano M, Bazzicalupi C, García-Gallarín C, López de la Torre MD, Bianchi A, Melguizo M. Supramolecular forces and their interplay in stabilizing complexes of organic anions: tuning binding selectivity in water. Org Chem Front 2019. [DOI: 10.1039/c8qo01152d] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The interplay of different supramolecular forces in stabilizing organic anion complexes with s-tetrazine-based ligands in aqueous solution: a microscopic description.
Collapse
Affiliation(s)
- Matteo Savastano
- Department of Chemistry “Ugo Schiff”
- University of Florence
- 50019 Sesto Fiorentino
- Italy
- CSGI
| | - Carla Bazzicalupi
- Department of Chemistry “Ugo Schiff”
- University of Florence
- 50019 Sesto Fiorentino
- Italy
| | | | | | - Antonio Bianchi
- Department of Chemistry “Ugo Schiff”
- University of Florence
- 50019 Sesto Fiorentino
- Italy
| | - Manuel Melguizo
- Department of Inorganic and Organic Chemistry
- University of Jaén
- 23071 Jaén
- Spain
| |
Collapse
|
32
|
Nocentini A, Carta F, Tanc M, Selleri S, Supuran CT, Bazzicalupi C, Gratteri P. Deciphering the Mechanism of Human Carbonic Anhydrases Inhibition with Sulfocoumarins: Computational and Experimental Studies. Chemistry 2018; 24:7840-7844. [DOI: 10.1002/chem.201800941] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2018] [Revised: 03/22/2018] [Indexed: 01/07/2023]
Affiliation(s)
- Alessio Nocentini
- Department NEUROFARBA-Pharmaceutical and nutraceutical section; Laboratory of Molecular Modeling Cheminformatics & QSAR; University of Firenze; via Ugo Schiff 6 50019 Sesto Fiorentino Italy
- Department NEUROFARBA-Pharmaceutical and nutraceutical section; University of Firenze; via Ugo Schiff 6 50019 Sesto Fiorentino Italy
| | - Fabrizio Carta
- Department NEUROFARBA-Pharmaceutical and nutraceutical section; University of Firenze; via Ugo Schiff 6 50019 Sesto Fiorentino Italy
| | - Muhammet Tanc
- Department NEUROFARBA-Pharmaceutical and nutraceutical section; University of Firenze; via Ugo Schiff 6 50019 Sesto Fiorentino Italy
| | - Silvia Selleri
- Department NEUROFARBA-Pharmaceutical and nutraceutical section; University of Firenze; via Ugo Schiff 6 50019 Sesto Fiorentino Italy
| | - Claudiu T. Supuran
- Department NEUROFARBA-Pharmaceutical and nutraceutical section; University of Firenze; via Ugo Schiff 6 50019 Sesto Fiorentino Italy
| | - Carla Bazzicalupi
- Department of Chemistry “U. Schiff”; University of Florence; Via della Lastruccia 3 50019 Sesto Fiorentino Italy
| | - Paola Gratteri
- Department NEUROFARBA-Pharmaceutical and nutraceutical section; Laboratory of Molecular Modeling Cheminformatics & QSAR; University of Firenze; via Ugo Schiff 6 50019 Sesto Fiorentino Italy
| |
Collapse
|
33
|
Savastano M, Bazzicalupi C, García-Gallarín C, Giorgi C, López de la Torre MD, Pichierri F, Bianchi A, Melguizo M. Halide and hydroxide anion binding in water. Dalton Trans 2018; 47:3329-3338. [PMID: 29423483 DOI: 10.1039/c7dt04430e] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The formation of halide and hydroxide anion complexes with two ligands L1 (3,6-bis(morpholin-4-ylmethyl)-1,2,4,5-tetrazine) and L2 (3,6-bis(morpholin-4-ylethyl)-1,2,4,5-tetrazine) was studied in aqueous solution, by means of potentiometric and ITC procedures. In the solid state, HF2-, Cl- and Br- complexes of H2L22+ were analysed by single crystal XRD measurements. Further information on the latter was obtained with the use of density functional theory (DFT) calculations in combination with the polarizable continuum model (PCM). The presence of two halide or bifluoride HF2- (F-H-F-) anions forming anion-π interactions, respectively above and below the ligand tetrazine ring, is the leitmotiv of the [(H2L2)X2] (X = HF2, Cl, Br, I) complexes in the solid state, while hydrogen bonding between the anions and protonated morpholine ligand groups contributes to strengthen the anion-ligand interaction, in particular in the case of Cl- and Br-. In contrast to the solid state, only the anion : ligand complexes of 1 : 1 stoichiometry were found in solution. The stability of these complexes displays the peculiar trend I- > F- > Br- > Cl- which was rationalized in terms of electrostatic, hydrogen bond, anion-π interactions and solvent effects. DFT calculations performed on [(H2L2)X]+ (X = F, Cl, Br, I) in PCM water suggested that the ligand assumes a U-shaped conformation to form one anion-π and two salt bridge interactions with the included anions and furnished structural information to interpret the solvation effects affecting complex formation. The formation of hydroxide anion complexes with neutral (not protonated) L1 and L2 molecules represents an unprecedented case in water. The stability of the [L(OH)]- (L = L1, L2) complexes is comparable to or higher than the stability of halide complexes with protonated ligand molecules, their formation being promoted by largely favourable enthalpic contributions that prevail over unfavourable entropic changes.
Collapse
Affiliation(s)
- M Savastano
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3, 50019, Sesto Fiorentino, Italy.
| | | | | | | | | | | | | | | |
Collapse
|
34
|
Caporali M, Calvo FD, Bazzicalupi C, Seniori Costantini S, Peruzzini M. Influence of highly basic phosphine ligand on the reactivity and hydrolysis of P 4 and P 4 S 3 supported by ruthenium fragments. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2018.01.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
35
|
Savastano M, Bazzicalupi C, García C, Gellini C, López de la Torre MD, Mariani P, Pichierri F, Bianchi A, Melguizo M. Iodide and triiodide anion complexes involving anion-π interactions with a tetrazine-based receptor. Dalton Trans 2018; 46:4518-4529. [PMID: 28262880 DOI: 10.1039/c7dt00134g] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Protonated forms of the tetrazine ligand L2 (3,6-bis(morpholin-4-ylethyl)-1,2,4,5-tetrazine) interact with iodide in aqueous solution forming relatively stable complexes (ΔG° = -11.6(4) kJ mol-1 for HL2+ + I- = (HL2)I and ΔG° = -13.4(2) kJ mol-1 for H2L22+ + I- = [(H2L2)I]+). When solutions of [(H2L2)I]+ are left in contact with air, crystals of the oxidation product (H2L2)2(I3)3I·4H2O are formed. Unfortunately, the low solubility of I3- complexes prevents the determination of their stability constants. The crystal structures of H2L2I2·H2O (1), H2L2(I3)2·2H2O (2) and (H2L2)2(I3)3I·4H2O (3) were determined by means of X-ray diffraction analyses. In all crystal structures, it was found that the interaction between I- and I3- with H2L22+ is dominated by anion interactions with the π electron density of the receptor. Only in the case of 1, the iodide anions involved in close anion-π interactions with the ligand tetrazine ring form an additional H-bond with the protonated morpholine nitrogen of an adjacent ligand molecule. Conversely, in crystals of 2 and 3 there are alternate segregated planes which contain only protonated ligands hydrogen-bonded to cocrystallized water molecules or I3- and I- forming infinite two-dimensional networks established through short interhalogen contacts, making these crystalline products good candidates to behave as solid conductors. In the solid complexes, the triiodide anion displays both end-on and side-on interaction modes with the tetrazine ring, in agreement with density functional theory calculations indicating a preference for the alignment of the I3- molecular axis with the molecular axis of the ligand. Further information about geometries and structures of triiodide anions in 2 and 3 was acquired by the analysis of their Raman spectra.
Collapse
Affiliation(s)
- Matteo Savastano
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3, 50019, Sesto Fiorentino, Italy.
| | - Carla Bazzicalupi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3, 50019, Sesto Fiorentino, Italy.
| | - Celeste García
- Department of Inorganic and Organic Chemistry, University of Jaén 23071, Jaén, Spain.
| | - Cristina Gellini
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3, 50019, Sesto Fiorentino, Italy.
| | | | - Palma Mariani
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3, 50019, Sesto Fiorentino, Italy.
| | - Fabio Pichierri
- Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan.
| | - Antonio Bianchi
- Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia 3, 50019, Sesto Fiorentino, Italy.
| | - Manuel Melguizo
- Department of Inorganic and Organic Chemistry, University of Jaén 23071, Jaén, Spain.
| |
Collapse
|
36
|
Guarra F, Marzo T, Ferraroni M, Papi F, Bazzicalupi C, Gratteri P, Pescitelli G, Messori L, Biver T, Gabbiani C. Interaction of a gold(i) dicarbene anticancer drug with human telomeric DNA G-quadruplex: solution and computationally aided X-ray diffraction analysis. Dalton Trans 2018; 47:16132-16138. [DOI: 10.1039/c8dt03607a] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Solution and solid-state data give a quite clear picture for a bis carbene gold(i) complex having perspective anticancer properties.
Collapse
Affiliation(s)
- Federica Guarra
- Department of Chemistry and Industrial Chemistry
- University of Pisa
- 56124 Pisa
- Italy
| | - Tiziano Marzo
- Department of Chemistry and Industrial Chemistry
- University of Pisa
- 56124 Pisa
- Italy
- MetMed Lab
| | - Marta Ferraroni
- Department of Chemistry “U. Schiff”
- University of Florence
- 50019 Sesto Fiorentino
- Italy
| | - Francesco Papi
- Department of Chemistry “U. Schiff”
- University of Florence
- 50019 Sesto Fiorentino
- Italy
| | - Carla Bazzicalupi
- Department of Chemistry “U. Schiff”
- University of Florence
- 50019 Sesto Fiorentino
- Italy
| | - Paola Gratteri
- Department NEUROFARBA – Pharmaceutical and nutraceutical section; Laboratory of Molecular Modeling Cheminformatics & QSAR
- University of Firenze
- 50019 Sesto Fiorentino, Firenze
- Italy
| | - Gennaro Pescitelli
- Department of Chemistry and Industrial Chemistry
- University of Pisa
- 56124 Pisa
- Italy
| | - Luigi Messori
- MetMed Lab
- Department of Chemistry “U. Schiff”
- University of Florence
- 50019 Sesto Fiorentino
- Italy
| | - Tarita Biver
- Department of Chemistry and Industrial Chemistry
- University of Pisa
- 56124 Pisa
- Italy
| | - Chiara Gabbiani
- Department of Chemistry and Industrial Chemistry
- University of Pisa
- 56124 Pisa
- Italy
| |
Collapse
|
37
|
Savastano M, García C, López de la Torre MD, Pichierri F, Bazzicalupi C, Bianchi A, Melguizo M. Interplay between salt bridge, hydrogen bond and anion-π interactions in thiocyanate binding. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.04.029] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
|
38
|
Papi F, Ferraroni M, Rigo R, Da Ros S, Bazzicalupi C, Sissi C, Gratteri P. Role of the Benzodioxole Group in the Interactions between the Natural Alkaloids Chelerythrine and Coptisine and the Human Telomeric G-Quadruplex DNA. A Multiapproach Investigation. J Nat Prod 2017; 80:3128-3135. [PMID: 29148767 DOI: 10.1021/acs.jnatprod.7b00350] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The binding properties toward the human telomeric G-quadruplex of the two natural alkaloids coptisine and chelerythrine were studied using spectroscopic techniques, molecular modeling, and X-ray diffraction analysis. The results were compared with reported data for the parent compounds berberine and sanguinarine. Spectroscopic studies showed modest, but different rearrangements of the DNA-ligand complexes, which can be explained considering particular stereochemical features for these alkaloids, in spite of the similarity of their skeletons. In fact, the presence of a dioxolo moiety rather than the two methoxy functions improves the efficiency of coptisine and sanguinarine in comparison to berberine and chelerythrine, and the overall stability trend is sanguinarine > chelerythrine ≈ coptisine > berberine. Accordingly, the X-ray diffraction analysis confirmed the involvement of the benzodioxolo groups in the coptisine/DNA binding by means of π···π, O···π, and CH···O interactions. Similar information is provided by modeling studies, which, additionally, evidenced reasons for the quadruplex vs double-helix selectivity shown by these alkaloids. Thus, the analyses shed light on the key role of the benzodioxolo moieties in strengthening the interaction with the G4-folded human telomeric sequence and indicated the superior G4 stabilizing properties of the benzophenanthridine scaffold with respect to the protoberberine one and conversely the better G4 vs dsDNA selectivity profile of coptisine over the other alkaloids.
Collapse
Affiliation(s)
- F Papi
- Department of Chemistry "U. Schiff", University of Florence , Via della Lastruccia 3, 50019 Sesto Fiorentino, Florence, Italy
- Department Neurofarba-Pharmaceutical and Nutraceutical Section and Laboratory of Molecular Modeling Cheminformatics & QSAR, University of Florence , Via U. Schiff 6, 50019 Sesto Fiorentino, Florence, Italy
| | - M Ferraroni
- Department of Chemistry "U. Schiff", University of Florence , Via della Lastruccia 3, 50019 Sesto Fiorentino, Florence, Italy
| | - R Rigo
- Department of Pharmaceutical and Pharmacological Science, University of Padua , Via F. Marzolo 5, 35131 Padua, Italy
| | - S Da Ros
- Department of Pharmaceutical and Pharmacological Science, University of Padua , Via F. Marzolo 5, 35131 Padua, Italy
| | - C Bazzicalupi
- Department of Chemistry "U. Schiff", University of Florence , Via della Lastruccia 3, 50019 Sesto Fiorentino, Florence, Italy
| | - C Sissi
- Department of Pharmaceutical and Pharmacological Science, University of Padua , Via F. Marzolo 5, 35131 Padua, Italy
| | - P Gratteri
- Department Neurofarba-Pharmaceutical and Nutraceutical Section and Laboratory of Molecular Modeling Cheminformatics & QSAR, University of Florence , Via U. Schiff 6, 50019 Sesto Fiorentino, Florence, Italy
| |
Collapse
|
39
|
Martínez L, Bazzicalupi C, Bianchi A, Lloret F, González R, Kremer C, Chiozzone R. Structural and magnetic properties of polynuclear oximate copper complexes with different topologies. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.09.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
40
|
Papi F, Bazzicalupi C, Ferraroni M, Massai L, Bertrand B, Gratteri P, Colangelo D, Messori L. [Au(9-methylcaffein-8-ylidene)2
]+
/DNA Tel23 System: Solution, Computational, and Biological Studies. Chemistry 2017; 23:13784-13791. [DOI: 10.1002/chem.201702854] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Indexed: 12/16/2022]
Affiliation(s)
- Francesco Papi
- Dipartimento di Chimica “Ugo Schiff”; Università degli Studi di Firenze; Via della Lastruccia 3 50019 Sesto Fiorentino (FI Italy
- Dipartimento di Neuroscienze, Psicologia, Area del Farmaco, Salute del Bambino (NEUROFARBA); Laboratory of Molecular Modeling Cheminformatics & QSAR; Università degli Studi di Firenze; Via Ugo Schiff 6 50019 Sesto Fiorentino (FI Italy
| | - Carla Bazzicalupi
- Dipartimento di Chimica “Ugo Schiff”; Università degli Studi di Firenze; Via della Lastruccia 3 50019 Sesto Fiorentino (FI Italy
| | - Marta Ferraroni
- Dipartimento di Chimica “Ugo Schiff”; Università degli Studi di Firenze; Via della Lastruccia 3 50019 Sesto Fiorentino (FI Italy
| | - Lara Massai
- Dipartimento di Chimica “Ugo Schiff”; Università degli Studi di Firenze; Via della Lastruccia 3 50019 Sesto Fiorentino (FI Italy
| | | | - Paola Gratteri
- Dipartimento di Neuroscienze, Psicologia, Area del Farmaco, Salute del Bambino (NEUROFARBA); Laboratory of Molecular Modeling Cheminformatics & QSAR; Università degli Studi di Firenze; Via Ugo Schiff 6 50019 Sesto Fiorentino (FI Italy
| | - Donato Colangelo
- Dipartimento di Scienze della Salute; Università del Piemonte Orientale ‘A. Avogadro'; Via Solaroli 17 28100 Novara Italy
| | - Luigi Messori
- Dipartimento di Chimica “Ugo Schiff”; Università degli Studi di Firenze; Via della Lastruccia 3 50019 Sesto Fiorentino (FI Italy
| |
Collapse
|
41
|
Savastano M, Arranz-Mascarós P, Bazzicalupi C, Clares MP, Godino-Salido ML, Gutiérrez-Valero MD, Inclán M, Bianchi A, García-España E, López-Garzón R. Construction of green nanostructured heterogeneous catalysts via non-covalent surface decoration of multi-walled carbon nanotubes with Pd(II) complexes of azamacrocycles. J Catal 2017. [DOI: 10.1016/j.jcat.2017.07.023] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
42
|
Savastano M, Arranz-Mascarós P, Bazzicalupi C, Clares MP, Godino-Salido ML, Guijarro L, Gutiérrez-Valero MD, Bianchi A, García-España E, López-Garzón R. Polyfunctional Tetraaza-Macrocyclic Ligands: Zn(II), Cu(II) Binding and Formation of Hybrid Materials with Multiwalled Carbon Nanotubes. ACS Omega 2017; 2:3868-3877. [PMID: 31457693 PMCID: PMC6641023 DOI: 10.1021/acsomega.7b00736] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Accepted: 07/07/2017] [Indexed: 05/08/2023]
Abstract
The binding properties of HL1, HL2, and HL3 ligands toward Cu(II) and Zn(II) ions, constituted by tetraaza-macrocyclic rings decorated with pyrimidine pendants, were investigated by means of potentiometric and UV spectrophotometric measurements in aqueous solution, with the objective of using the related HL-M(II) (HL = HL1-HL3; M = Cu, Zn) complexes for the preparation of hybrid MWCNT-HL-M(II) materials based on multiwalled carbon nanotubes (MWCNTs), through an environmentally friendly noncovalent procedure. As shown by the crystal structure of [Cu(HL1)](ClO4)2, metal coordination takes place in the macrocyclic ring, whereas the pyrimidine residue remains available for attachment onto the surface of the MWCNTs via π-π stacking interactions. On the basis of equilibrium data showing the formation of highly stable Cu(II) complexes, the MWCNT-HL1-Cu(II) material was prepared and characterized. This compound proved very stable toward lixiviation processes (release of HL1 and/or Cu(II)); thus, it was used for the preparation of its reduced MWCNT-HL1-Cu(0) derivatives. X-ray photoelectron spectroscopy and transmission electron microscopy images showed that MWCNT-HL1-Cu(0) contains Cu(0) nanoparticles, of very small (less than 5 nm) and regular size, uniformly distributed over the surface of the MWCNTs. Also, the MWCNT-HL1-Cu(0) material proved very resistant to detachment of its components. Accordingly, both MWCNT-HL1-Cu(II) and MWCNT-HL1-Cu(0) are promising candidates for applications in heterogeneous catalysis.
Collapse
Affiliation(s)
- Matteo Savastano
- Department
of Chemistry “Ugo Schiff”, University of Florence, 50019 Sesto Fiorentino, Italy
| | | | - Carla Bazzicalupi
- Department
of Chemistry “Ugo Schiff”, University of Florence, 50019 Sesto Fiorentino, Italy
| | - Maria Paz Clares
- Institute
of Molecular Science, University of Valencia, 46071 Valencia, Spain
| | | | - Lluis Guijarro
- Institute
of Molecular Science, University of Valencia, 46071 Valencia, Spain
| | | | - Antonio Bianchi
- Department
of Chemistry “Ugo Schiff”, University of Florence, 50019 Sesto Fiorentino, Italy
- E-mail: (A.B.)
| | - Enrique García-España
- Institute
of Molecular Science, University of Valencia, 46071 Valencia, Spain
- E-mail: (E.G.E.)
| | - Rafael López-Garzón
- Department
of Inorganic and Organic Chemistry, University
of Jaén, 23071 Jaén, Spain
- E-mail: (R.L.G.)
| |
Collapse
|
43
|
Wirmer-Bartoschek J, Bendel LE, Jonker HRA, Grün JT, Papi F, Bazzicalupi C, Messori L, Gratteri P, Schwalbe H. Solution NMR Structure of a Ligand/Hybrid-2-G-Quadruplex Complex Reveals Rearrangements that Affect Ligand Binding. Angew Chem Int Ed Engl 2017; 56:7102-7106. [DOI: 10.1002/anie.201702135] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Revised: 03/31/2017] [Indexed: 01/19/2023]
Affiliation(s)
- Julia Wirmer-Bartoschek
- Institute for Organic Chemistry and Chemical Biology; Center of Biomolecular Magnetic Resonance (BMRZ); Goethe University Frankfurt/Main; Max-von-Laue-Strasse 7 60439 Frankfurt Germany
| | - Lars Erik Bendel
- Institute for Organic Chemistry and Chemical Biology; Center of Biomolecular Magnetic Resonance (BMRZ); Goethe University Frankfurt/Main; Max-von-Laue-Strasse 7 60439 Frankfurt Germany
| | - Hendrik R. A. Jonker
- Institute for Organic Chemistry and Chemical Biology; Center of Biomolecular Magnetic Resonance (BMRZ); Goethe University Frankfurt/Main; Max-von-Laue-Strasse 7 60439 Frankfurt Germany
| | - J. Tassilo Grün
- Institute for Organic Chemistry and Chemical Biology; Center of Biomolecular Magnetic Resonance (BMRZ); Goethe University Frankfurt/Main; Max-von-Laue-Strasse 7 60439 Frankfurt Germany
| | - Francesco Papi
- Dipartimento di Chimica “Ugo Schiff”; Università degli Studi di Firenze; Via della Lastruccia 3 50019 Sesto Fiorentino (FI) Italy
| | - Carla Bazzicalupi
- Dipartimento di Chimica “Ugo Schiff”; Università degli Studi di Firenze; Via della Lastruccia 3 50019 Sesto Fiorentino (FI) Italy
| | - Luigi Messori
- Dipartimento di Chimica “Ugo Schiff”; Università degli Studi di Firenze; Via della Lastruccia 3 50019 Sesto Fiorentino (FI) Italy
| | - Paola Gratteri
- Dipartimento di Neuroscienze, Psicologia, Area del Farmaco; Salute del Bambino (NEUROFARBA); Università degli Studi di Firenze; via Ugo Schiff 6 50019 Sesto Fiorentino Italy
| | - Harald Schwalbe
- Institute for Organic Chemistry and Chemical Biology; Center of Biomolecular Magnetic Resonance (BMRZ); Goethe University Frankfurt/Main; Max-von-Laue-Strasse 7 60439 Frankfurt Germany
| |
Collapse
|
44
|
Savastano M, Bazzicalupi C, Giorgi C, Gratteri P, Bianchi A. Cation, Anion and Ion-Pair Complexes with a G-3 Poly(ethylene imine) Dendrimer in Aqueous Solution. Molecules 2017; 22:molecules22050816. [PMID: 28509862 PMCID: PMC6154109 DOI: 10.3390/molecules22050816] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Revised: 05/12/2017] [Accepted: 05/12/2017] [Indexed: 11/16/2022] Open
Abstract
The G-3 poly(ethylene imine) ligand L2 shows a multifaceted coordination ability, being able to bind metal cations, anions and ion-pairs. The equilibrium constants for the formation of metal (Cu2+, Zn2+), anion (SO₄2-) and ion-pair (Cu2+/SO₄2-) complexes were determined in 0.1 M Me₄NCl aqueous solution at 298.1 ± 0.1 K by means of potentiometric titrations. Thanks to its dendrimeric nature, L2 can form highly nucleated metal complexes, such as Cu₅L210+ and Zn₄L28+, in successive and well-defined complexation steps. Protonated forms of L2 give rise to relatively weak anion complexes with SO₄2-, but the addition of Cu2+ significantly enhances the binding ability of the ligand toward this anion below pH 9. In more alkaline solutions, an opposite trend is observed. The coordination properties of L2 are discussed with the support of modelling calculations. According to results, L2 is a promising molecule for the preparation of solid supported materials for the recovery of cations and anions from aqueous media and/or for applications in heterogeneous catalysis.
Collapse
Affiliation(s)
- Matteo Savastano
- Department of Chemistry "Ugo Schiff", via della Lastruccia 3, 50019 Sesto Fiorentino, Italy.
| | - Carla Bazzicalupi
- Department of Chemistry "Ugo Schiff", via della Lastruccia 3, 50019 Sesto Fiorentino, Italy.
| | - Claudia Giorgi
- Department of Chemistry "Ugo Schiff", via della Lastruccia 3, 50019 Sesto Fiorentino, Italy.
| | - Paola Gratteri
- NEUROFARBA Department, Pharmaceutical and Nutraceutical Section, and Laboratory of Molecular Modeling Cheminformatics & QSAR, University of Florence, Via Ugo Schiff 6, 50019 Sesto Fiorentino, Italy.
| | - Antonio Bianchi
- Department of Chemistry "Ugo Schiff", via della Lastruccia 3, 50019 Sesto Fiorentino, Italy.
| |
Collapse
|
45
|
Wirmer-Bartoschek J, Bendel LE, Jonker HRA, Grün JT, Papi F, Bazzicalupi C, Messori L, Gratteri P, Schwalbe H. Solution NMR Structure of a Ligand/Hybrid-2-G-Quadruplex Complex Reveals Rearrangements that Affect Ligand Binding. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201702135] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Julia Wirmer-Bartoschek
- Institute for Organic Chemistry and Chemical Biology; Center of Biomolecular Magnetic Resonance (BMRZ); Goethe University Frankfurt/Main; Max-von-Laue-Strasse 7 60439 Frankfurt Germany
| | - Lars Erik Bendel
- Institute for Organic Chemistry and Chemical Biology; Center of Biomolecular Magnetic Resonance (BMRZ); Goethe University Frankfurt/Main; Max-von-Laue-Strasse 7 60439 Frankfurt Germany
| | - Hendrik R. A. Jonker
- Institute for Organic Chemistry and Chemical Biology; Center of Biomolecular Magnetic Resonance (BMRZ); Goethe University Frankfurt/Main; Max-von-Laue-Strasse 7 60439 Frankfurt Germany
| | - J. Tassilo Grün
- Institute for Organic Chemistry and Chemical Biology; Center of Biomolecular Magnetic Resonance (BMRZ); Goethe University Frankfurt/Main; Max-von-Laue-Strasse 7 60439 Frankfurt Germany
| | - Francesco Papi
- Dipartimento di Chimica “Ugo Schiff”; Università degli Studi di Firenze; Via della Lastruccia 3 50019 Sesto Fiorentino (FI) Italy
| | - Carla Bazzicalupi
- Dipartimento di Chimica “Ugo Schiff”; Università degli Studi di Firenze; Via della Lastruccia 3 50019 Sesto Fiorentino (FI) Italy
| | - Luigi Messori
- Dipartimento di Chimica “Ugo Schiff”; Università degli Studi di Firenze; Via della Lastruccia 3 50019 Sesto Fiorentino (FI) Italy
| | - Paola Gratteri
- Dipartimento di Neuroscienze, Psicologia, Area del Farmaco; Salute del Bambino (NEUROFARBA); Università degli Studi di Firenze; via Ugo Schiff 6 50019 Sesto Fiorentino Italy
| | - Harald Schwalbe
- Institute for Organic Chemistry and Chemical Biology; Center of Biomolecular Magnetic Resonance (BMRZ); Goethe University Frankfurt/Main; Max-von-Laue-Strasse 7 60439 Frankfurt Germany
| |
Collapse
|
46
|
Quiñone D, Veiga N, Torres J, Bazzicalupi C, Bianchi A, Kremer C. Self-Assembly of Manganese(II)-Phytate Coordination Polymers: Synthesis, Crystal Structure, and Physicochemical Properties. Chempluschem 2017; 82:721-731. [DOI: 10.1002/cplu.201700027] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Revised: 03/14/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Delfina Quiñone
- Departamento Estrella Campos; Facultad de Química; Universidad de la República; General Flores 2124 Montevideo Uruguay
| | - Nicolás Veiga
- Departamento Estrella Campos; Facultad de Química; Universidad de la República; General Flores 2124 Montevideo Uruguay
| | - Julia Torres
- Departamento Estrella Campos; Facultad de Química; Universidad de la República; General Flores 2124 Montevideo Uruguay
| | - Carla Bazzicalupi
- Dipartimento di Chimica “Ugo Schiff”; Universitá degli Studi di Firenze; Via della Lastruccia, 3 50019 Sesto Fiorentino Italy
| | - Antonio Bianchi
- Dipartimento di Chimica “Ugo Schiff”; Universitá degli Studi di Firenze; Via della Lastruccia, 3 50019 Sesto Fiorentino Italy
| | - Carlos Kremer
- Departamento Estrella Campos; Facultad de Química; Universidad de la República; General Flores 2124 Montevideo Uruguay
| |
Collapse
|
47
|
Elmehdawi RM, El-Kaheli MN, Abuhmaiera RG, Treish FA, Ben Younes MEM, Bazzicalupi C, Guerri A, Caneschi A, Amjad A. Synthesis, Crystal Structure, and Magnetic Properties of a New Mixed Metal (Co(II), Ni(II)) Cubane. Materials (Basel) 2017; 10:ma10020178. [PMID: 28772539 PMCID: PMC5459200 DOI: 10.3390/ma10020178] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2017] [Revised: 02/03/2017] [Accepted: 02/04/2017] [Indexed: 11/25/2022]
Abstract
The mixed Co(II)/Ni(II) complex, [Co2.67Ni1.33L4(CH3COO)2][BPh4]2·0.75H2O where HL = 4-(salicylaldimine)antipyrine, was isolated as an orange solid from the reaction of 4-(salicylaldimine)antipyrine, with mixed cobalt(II) acetate and nickel(II) acetate in ethanol. The complex was characterized by Frustrated Total Internal Reflection (FTIR), UltraViolet Visible spectroscopy (UV-Vis), X-ray single crystal diffraction, and by elemental analysis. The complex is composed of two symmetry independent cationic units, A and B. The two units are essentially isostructural; nevertheless, small differences exist between them. The units contain four metal atoms, arranged at the corners of a distorted cubane-like core alternately with phenoxy oxygen of the Schiff base. The overall eight corners occupied by metal ions in the asymmetric unit are shared between cobalt and nickel in a 5.33:2.67 ratio. Each metal divalent cation binds three coordinated sites from the corresponding tridentate Schiff base ligand, the fourth one is bound by the acetate oxygen, the fifth and the sixth donor sites come from the phenolate oxygens of other Schiff base ligands. Intermolecular hydrogen bonds join the complexes to the water molecules present in the crystal packing. The magnetic characterization was carried out for this new complex and for its isostructural counterpart containing only cobalt ions. The magnetic measurements for the cobalt(II)/nickel(II) mixed compound indicate either antiferromagnetic interactions among the two cubanes or an anisotropic contribution, whereas a ferromagnetic interaction is observed within the cubane, for both the complexes, as expected by geometrical considerations. A comparison between the magnetic properties of the pure cobalt(II) derivative and similar systems discussed in literature, is presented.
Collapse
Affiliation(s)
| | | | | | | | | | - Carla Bazzicalupi
- Chemistry Department, "U. Schiff", University of Florence, Sesto Fiorentino (Fl) 50019, Italy.
| | - Annalisa Guerri
- Chemistry Department, "U. Schiff", University of Florence, Sesto Fiorentino (Fl) 50019, Italy.
| | - Andrea Caneschi
- Chemistry Department, "U. Schiff", University of Florence, Sesto Fiorentino (Fl) 50019, Italy.
- INSTM-Research Unit at University of Florence, Sesto Fiorentino (Fl) 50019, Italy.
| | - Asma Amjad
- Chemistry Department, "U. Schiff", University of Florence, Sesto Fiorentino (Fl) 50019, Italy.
- INSTM-Research Unit at University of Florence, Sesto Fiorentino (Fl) 50019, Italy.
| |
Collapse
|
48
|
Miljanić S, Ratkaj M, Matković M, Piantanida I, Gratteri P, Bazzicalupi C. Assessment of human telomeric G-quadruplex structures using surface-enhanced Raman spectroscopy. Anal Bioanal Chem 2017; 409:2285-2295. [DOI: 10.1007/s00216-016-0172-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Revised: 12/13/2016] [Accepted: 12/20/2016] [Indexed: 10/20/2022]
|
49
|
Savastano M, Bazzicalupi C, Giorgi C, García-Gallarín C, López de la Torre MD, Pichierri F, Bianchi A, Melguizo M. Anion Complexes with Tetrazine-Based Ligands: Formation of Strong Anion-π Interactions in Solution and in the Solid State. Inorg Chem 2016; 55:8013-24. [PMID: 27454810 DOI: 10.1021/acs.inorgchem.6b01138] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Ligands L1 and L2, consisting of a tetrazine ring decorated with two morpholine pendants of different lengths, show peculiar anion-binding behaviors. In several cases, even the neutral ligands, in addition to their protonated HL(+) and H2L(2+) (L = L1 and L2) forms, bind anions such as F(-), NO3(-), PF6(-), ClO4(-), and SO4(2-) to form stable complexes in water. The crystal structures of H2L1(PF6)2·2H2O, H2L1(ClO4)2·2H2O, H2L2(NO3)2, H2L2(PF6)2·H2O, and H2L2(ClO4)2·H2O show that anion-π interactions are pivotal for the formation of these complexes, although other weak forces may contribute to their stability. Complex stability constants were determined by means of potentiometric titration in aqueous solution at 298.1 K, while dissection of the free-energy change of association (ΔG°) into its enthalpic (ΔH°) and entropic (TΔS°) components was accomplished by means of isothermal titration calorimetry measurements. Stability constants are poorly regulated by anion-ligand charge-charge attraction. Thermodynamic data show that the formation of complexes with neutral ligands, which are principally stabilized by anion-π interactions, is enthalpically favorable (-ΔG°, 11.1-17.5 kJ/mol; ΔH°, -2.3 to -0.5 kJ/mol; TΔS°, 9.0-17.0 kJ/mol), while for charged ligands, enthalpy changes are mostly unfavorable. Complexation reactions are invariably promoted by large and favorable entropic contributions. The importance of desolvation phenomena manifested by such thermodynamic data was confirmed by the hydrodynamic results obtained by means of diffusion NMR spectroscopy. In the case of L2, complexation equilibria were also studied in a 80:20 (v/v) water/ethanol mixture. In this mixed solvent of lower dielectric constant than water, the stability of anion complexes decreases, relative to water. Solvation effects, mostly involving the ligand, are thought to be responsible for this peculiar behavior.
Collapse
Affiliation(s)
- Matteo Savastano
- Department of Chemistry "Ugo Schiff", University of Florence , Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
| | - Carla Bazzicalupi
- Department of Chemistry "Ugo Schiff", University of Florence , Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
| | - Claudia Giorgi
- Department of Chemistry "Ugo Schiff", University of Florence , Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
| | | | | | - Fabio Pichierri
- Department of Applied Chemistry, Graduate School of Engineering, Tohoku University , 980-8579 Sendai, Japan
| | - Antonio Bianchi
- Department of Chemistry "Ugo Schiff", University of Florence , Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
| | - Manuel Melguizo
- Department of Inorganic and Organic Chemistry, University of Jaén , 23071 Jaén, Spain
| |
Collapse
|
50
|
Ferraroni M, Bazzicalupi C, Papi F, Fiorillo G, Guamán-Ortiz LM, Nocentini A, Scovassi AI, Lombardi P, Gratteri P. Solution and Solid-State Analysis of Binding of 13-Substituted Berberine Analogues to Human Telomeric G-quadruplexes. Chem Asian J 2016; 11:1107-15. [DOI: 10.1002/asia.201600116] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Indexed: 12/29/2022]
Affiliation(s)
- Marta Ferraroni
- Department of Chemistry; University of Florence; Via della Lastruccia 3 50019 Sesto Fiorentino FI Italy
| | - Carla Bazzicalupi
- Department of Chemistry; University of Florence; Via della Lastruccia 3 50019 Sesto Fiorentino FI Italy
| | - Francesco Papi
- Department of Chemistry; University of Florence; Via della Lastruccia 3 50019 Sesto Fiorentino FI Italy
- Department NEUROFARBA-Pharmaceutical and nutraceutical section; Laboratory of Molecular Modeling Cheminformatics&QSAR; University of Firenze; via Ugo Schiff 6 50019 Sesto Fiorentino, Firenze Italy
| | - Gaetano Fiorillo
- Naxospharma srl; via G. Di Vittorio, 70 20026 Novate Milanese Italy
| | - Luis Miguel Guamán-Ortiz
- Universidad Técnica Particular de Loja; Departamento de Ciencias de la Salud; San Cayetano Alto Calle Paris 1101608 Loja Ecuador
- Istituto di Genetica Molecolare del CNR, Via Abbiategrasso 207; 27100 Pavia Italy
| | - Alessio Nocentini
- Department NEUROFARBA-Pharmaceutical and nutraceutical section; Laboratory of Molecular Modeling Cheminformatics&QSAR; University of Firenze; via Ugo Schiff 6 50019 Sesto Fiorentino, Firenze Italy
| | - Anna Ivana Scovassi
- Istituto di Genetica Molecolare del CNR, Via Abbiategrasso 207; 27100 Pavia Italy
| | - Paolo Lombardi
- Naxospharma srl; via G. Di Vittorio, 70 20026 Novate Milanese Italy
| | - Paola Gratteri
- Department NEUROFARBA-Pharmaceutical and nutraceutical section; Laboratory of Molecular Modeling Cheminformatics&QSAR; University of Firenze; via Ugo Schiff 6 50019 Sesto Fiorentino, Firenze Italy
| |
Collapse
|