1
|
De Castro F, Stefàno E, Fanizzi FP, Di Corato R, Abdalla P, Luchetti F, Nasoni MG, Rinaldi R, Magnani M, Benedetti M, Antonelli A. Compatibility of Nucleobases Containing Pt(II) Complexes with Red Blood Cells for Possible Drug Delivery Applications. Molecules 2023; 28:6760. [PMID: 37836603 PMCID: PMC10574024 DOI: 10.3390/molecules28196760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 09/19/2023] [Accepted: 09/20/2023] [Indexed: 10/15/2023] Open
Abstract
The therapeutic advantages of some platinum complexes as major anticancer chemotherapeutic agents and of nucleoside analogue-based compounds as essential antiviral/antitumor drugs are widely recognized. Red blood cells (RBCs) offer a potential new strategy for the targeted release of therapeutic agents due to their biocompatibility, which can protect loaded drugs from inactivation in the blood, thus improving biodistribution. In this study, we evaluated the feasibility of loading model nucleobase-containing Pt(II) complexes into human RBCs that were highly stabilized by four N-donors and susceptible to further modification for possible antitumor/antiviral applications. Specifically, platinum-based nucleoside derivatives [PtII(dien)(N7-Guo)]2+, [PtII(dien)(N7-dGuo)]2+, and [PtII(dien)(N7-dGTP)] (dien = diethylenetriamine; Guo = guanosine; dGuo = 2'-deoxy-guanosine; dGTP = 5'-(2'-deoxy)-guanosine-triphosphate) were investigated. These Pt(II) complexes were demonstrated to be stable species suitable for incorporation into RBCs. This result opens avenues for the possible incorporation of other metalated nucleobases analogues, with potential antitumor and/or antiviral activity, into RBCs.
Collapse
Affiliation(s)
- Federica De Castro
- Department of Biological and Environmental Sciences and Technologies, University of Salento, Via Monteroni, 73100 Lecce, Italy; (F.D.C.); (E.S.)
| | - Erika Stefàno
- Department of Biological and Environmental Sciences and Technologies, University of Salento, Via Monteroni, 73100 Lecce, Italy; (F.D.C.); (E.S.)
| | - Francesco Paolo Fanizzi
- Department of Biological and Environmental Sciences and Technologies, University of Salento, Via Monteroni, 73100 Lecce, Italy; (F.D.C.); (E.S.)
| | - Riccardo Di Corato
- Center for Biomolecular Nanotechnologies, Istituto Italiano di Tecnologia, 73010 Arnesano, Italy;
- Institute for Microelectronics and Microsystems (IMM), CNR, Via Monteroni, 73100 Lecce, Italy;
| | - Pasant Abdalla
- Dipartimento di Scienze Biomolecolari, Università degli Studi di Urbino Carlo Bo, Via Saffi 2, 61029 Urbino, Italy; (P.A.); (F.L.); (M.G.N.); (M.M.)
| | - Francesca Luchetti
- Dipartimento di Scienze Biomolecolari, Università degli Studi di Urbino Carlo Bo, Via Saffi 2, 61029 Urbino, Italy; (P.A.); (F.L.); (M.G.N.); (M.M.)
| | - Maria Gemma Nasoni
- Dipartimento di Scienze Biomolecolari, Università degli Studi di Urbino Carlo Bo, Via Saffi 2, 61029 Urbino, Italy; (P.A.); (F.L.); (M.G.N.); (M.M.)
| | - Rosaria Rinaldi
- Institute for Microelectronics and Microsystems (IMM), CNR, Via Monteroni, 73100 Lecce, Italy;
- Mathematics and Physics “E. De Giorgi” Department, University of Salento, Via Monteroni, 73100 Lecce, Italy
| | - Mauro Magnani
- Dipartimento di Scienze Biomolecolari, Università degli Studi di Urbino Carlo Bo, Via Saffi 2, 61029 Urbino, Italy; (P.A.); (F.L.); (M.G.N.); (M.M.)
| | - Michele Benedetti
- Department of Biological and Environmental Sciences and Technologies, University of Salento, Via Monteroni, 73100 Lecce, Italy; (F.D.C.); (E.S.)
| | - Antonella Antonelli
- Dipartimento di Scienze Biomolecolari, Università degli Studi di Urbino Carlo Bo, Via Saffi 2, 61029 Urbino, Italy; (P.A.); (F.L.); (M.G.N.); (M.M.)
| |
Collapse
|
2
|
Stefàno E, Cossa LG, De Castro F, De Luca E, Vergaro V, My G, Rovito G, Migoni D, Muscella A, Marsigliante S, Benedetti M, Fanizzi FP. Evaluation of the Antitumor Effects of Platinum-Based [Pt( η1-C 2H 4-OR)(DMSO)(phen)] + (R = Me, Et) Cationic Organometallic Complexes on Chemoresistant Pancreatic Cancer Cell Lines. Bioinorg Chem Appl 2023; 2023:5564624. [PMID: 37727647 PMCID: PMC10506884 DOI: 10.1155/2023/5564624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 08/16/2023] [Accepted: 08/25/2023] [Indexed: 09/21/2023] Open
Abstract
Pancreatic cancer is one of the most lethal malignancies with an increasing incidence and a high mortality rate, due to its rapid progression, invasiveness, and resistance to anticancer therapies. In this work, we evaluated the antiproliferative and antimigratory activities of the two organometallic compounds, [Pt(η1-C2H4-OMe)(DMSO)(phen)]Cl (1) and [Pt(η1-C2H4-OEt)(DMSO)(phen)]Cl (2), on three human pancreatic ductal adenocarcinoma cell lines with different sensitivity to cisplatin (Mia PaCa-2, PANC-1, and YAPC). The two cationic analogues showed superimposable antiproliferative effects on the tested cells, without significant differences depending on alkyl chain length (Me or Et). On the other hand, they demonstrated to be more effective than cisplatin, especially on YAPC cancer cells. For the interesting cytotoxic activity observed on YAPC, further biological assays were performed, on this cancer cell line, to evaluate the apoptotic and antimetastatic properties of the considered platinum compounds (1 and 2). The cytotoxicity of 1 and 2 compounds appeared to be related to their intracellular accumulation, which was much faster than that of cisplatin. Both 1 and 2 compounds significantly induced apoptosis and cell cycle arrest, with a high accumulation of sub-G1 phase cells, compared to cisplatin. Moreover, phenanthroline-containing complexes caused a rapid loss of mitochondria membrane potential, ΔΨM, if compared to cisplatin, probably due to their cationic and lipophilic properties. On 3D tumor spheroids, 1 and 2 significantly reduced migrated area more than cisplatin, confirming an antimetastatic ability.
Collapse
Affiliation(s)
- Erika Stefàno
- Department of Biological and Environmental Sciences and Technologies (DiSTeBA), University of Salento, Via Monteroni, I-73100 Lecce, Italy
| | - Luca Giulio Cossa
- Department of Biological and Environmental Sciences and Technologies (DiSTeBA), University of Salento, Via Monteroni, I-73100 Lecce, Italy
| | - Federica De Castro
- Department of Biological and Environmental Sciences and Technologies (DiSTeBA), University of Salento, Via Monteroni, I-73100 Lecce, Italy
| | - Erik De Luca
- Department of Biological and Environmental Sciences and Technologies (DiSTeBA), University of Salento, Via Monteroni, I-73100 Lecce, Italy
| | - Viviana Vergaro
- Department of Biological and Environmental Sciences and Technologies (DiSTeBA), University of Salento, Via Monteroni, I-73100 Lecce, Italy
| | - Giulia My
- Department of Biological and Environmental Sciences and Technologies (DiSTeBA), University of Salento, Via Monteroni, I-73100 Lecce, Italy
| | - Gianluca Rovito
- Department of Biological and Environmental Sciences and Technologies (DiSTeBA), University of Salento, Via Monteroni, I-73100 Lecce, Italy
| | - Danilo Migoni
- Department of Biological and Environmental Sciences and Technologies (DiSTeBA), University of Salento, Via Monteroni, I-73100 Lecce, Italy
| | - Antonella Muscella
- Department of Biological and Environmental Sciences and Technologies (DiSTeBA), University of Salento, Via Monteroni, I-73100 Lecce, Italy
| | - Santo Marsigliante
- Department of Biological and Environmental Sciences and Technologies (DiSTeBA), University of Salento, Via Monteroni, I-73100 Lecce, Italy
| | - Michele Benedetti
- Department of Biological and Environmental Sciences and Technologies (DiSTeBA), University of Salento, Via Monteroni, I-73100 Lecce, Italy
| | - Francesco Paolo Fanizzi
- Department of Biological and Environmental Sciences and Technologies (DiSTeBA), University of Salento, Via Monteroni, I-73100 Lecce, Italy
| |
Collapse
|
3
|
De Castro F, Ciardullo G, Fanizzi FP, Prejanò M, Benedetti M, Marino T. Incorporation of N7-Platinated Guanines into Thermus Aquaticus (Taq) DNA Polymerase: Atomistic Insights from Molecular Dynamics Simulations. Int J Mol Sci 2023; 24:9849. [PMID: 37372996 DOI: 10.3390/ijms24129849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 06/03/2023] [Accepted: 06/05/2023] [Indexed: 06/29/2023] Open
Abstract
In this work, we elucidated some key aspects of the mechanism of action of the cisplatin anticancer drug, cis-[Pt(NH3)2Cl2], involving direct interactions with free nucleotides. A comprehensive in silico molecular modeling analysis was conducted to compare the interactions of Thermus aquaticus (Taq) DNA polymerase with three distinct N7-platinated deoxyguanosine triphosphates: [Pt(dien)(N7-dGTP)] (1), cis-[Pt(NH3)2Cl(N7-dGTP)] (2), and cis-[Pt(NH3)2(H2O)(N7-dGTP)] (3) {dien = diethylenetriamine; dGTP = 5'-(2'-deoxy)-guanosine-triphosphate}, using canonical dGTP as a reference, in the presence of DNA. The goal was to elucidate the binding site interactions between Taq DNA polymerase and the tested nucleotide derivatives, providing valuable atomistic insights. Unbiased molecular dynamics simulations (200 ns for each complex) with explicit water molecules were performed on the four ternary complexes, yielding significant findings that contribute to a better understanding of experimental results. The molecular modeling highlighted the crucial role of a specific α-helix (O-helix) within the fingers subdomain, which facilitates the proper geometry for functional contacts between the incoming nucleotide and the DNA template needed for incorporation into the polymerase. The analysis revealed that complex 1 exhibits a much lower affinity for Taq DNA polymerase than complexes 2-3. The affinities of cisplatin metabolites 2-3 for Taq DNA polymerase were found to be quite similar to those of natural dGTP, resulting in a lower incorporation rate for complex 1 compared to complexes 2-3. These findings could have significant implications for the cisplatin mechanism of action, as the high intracellular availability of free nucleobases might promote the competitive incorporation of platinated nucleotides over direct cisplatin attachment to DNA. The study's insights into the incorporation of platinated nucleotides into the Taq DNA polymerase active site suggest that the role of platinated nucleotides in the cisplatin mechanism of action may have been previously underestimated.
Collapse
Affiliation(s)
- Federica De Castro
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Prov.le Lecce-Monteroni, Centro Ecotekne, I-73100 Lecce, Italy
| | - Giada Ciardullo
- Dipartimento di Chimica e Tecnologie Chimiche, Laboratorio PROMOCS cubo 14C, Università della Calabria, I-87036 Rende, Italy
| | - Francesco Paolo Fanizzi
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Prov.le Lecce-Monteroni, Centro Ecotekne, I-73100 Lecce, Italy
| | - Mario Prejanò
- Dipartimento di Chimica e Tecnologie Chimiche, Laboratorio PROMOCS cubo 14C, Università della Calabria, I-87036 Rende, Italy
| | - Michele Benedetti
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Prov.le Lecce-Monteroni, Centro Ecotekne, I-73100 Lecce, Italy
| | - Tiziana Marino
- Dipartimento di Chimica e Tecnologie Chimiche, Laboratorio PROMOCS cubo 14C, Università della Calabria, I-87036 Rende, Italy
| |
Collapse
|
4
|
De Castro F, Stefàno E, De Luca E, Benedetti M, Fanizzi FP. Platinum-Nucleos(t)ide Compounds as Possible Antimetabolites for Antitumor/Antiviral Therapy: Properties and Perspectives. Pharmaceutics 2023; 15:pharmaceutics15030941. [PMID: 36986802 PMCID: PMC10058173 DOI: 10.3390/pharmaceutics15030941] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 03/06/2023] [Accepted: 03/12/2023] [Indexed: 03/16/2023] Open
Abstract
Nucleoside analogues (NAs) are a family of compounds which include a variety of purine and pyrimidine derivatives, widely used as anticancer and antiviral agents. For their ability to compete with physiological nucleosides, NAs act as antimetabolites exerting their activity by interfering with the synthesis of nucleic acids. Much progress in the comprehension of their molecular mechanisms has been made, including providing new strategies for potentiating anticancer/antiviral activity. Among these strategies, new platinum-NAs showing a good potential to improve the therapeutic indices of NAs have been synthesized and studied. This short review aims to describe the properties and future perspectives of platinum-NAs, proposing these complexes as a new class of antimetabolites.
Collapse
|
5
|
Mandriota G, Di Corato R, Benedetti M, De Castro F, Fanizzi FP, Rinaldi R. Design and Application of Cisplatin-Loaded Magnetic Nanoparticle Clusters for Smart Chemotherapy. ACS APPLIED MATERIALS & INTERFACES 2019; 11:1864-1875. [PMID: 30580523 DOI: 10.1021/acsami.8b18717] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
One of the major challenges of drug delivery is the development of suitable carriers for therapeutic molecules. In this work, a novel nanoformulation based on superparamagnetic nanoclusters [magnetic nanocrystal clusters (MNCs)] is presented. In order to control the size of the nanoclusters and the density of magnetic cores, several parameters were evaluated and tuned. Then, MNCs were functionalized with a polydopamine layer (MNC@PDO) to improve their stability in aqueous solution, to increase density of functional groups and to obtain a nanosystem suitable for drug-controlled release. Finally, cisplatin was grafted on the surface of MNC@PDO to exploit the system as a magnetic field-guided anticancer delivery system. The biocompatibility of MNC@PDO and the cytotoxic effects of MNC@PDO-cisplatin complex were determined against human cervical cancer (HeLa) and human breast adenocarcinoma (MCF-7) cells. In vitro studies demonstrated that the MNC@PDO-cisplatin complexes inhibited the cellular proliferation by a dose-dependent effect. Therefore, by applying an external magnetic field, the released drug exerted its effect on a specific target area. In summary, the MNC@PDO nanosystem has a great potential to be used in targeted nanomedicine for the delivery of other drugs or biofunctional molecules.
Collapse
Affiliation(s)
- Giacomo Mandriota
- Dipartimento di Matematica e Fisica "Ennio De Giorgi" , University of Salento , Via Arnesano , 73100 Lecce , Italy
| | - Riccardo Di Corato
- Dipartimento di Matematica e Fisica "Ennio De Giorgi" , University of Salento , Via Arnesano , 73100 Lecce , Italy
- Center for Biomolecular Nanotechnologies (CBN) , Istituto Italiano di Tecnologia (IIT) , Via Barsanti , Arnesano, 73010 Lecce , Italy
| | - Michele Benedetti
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali , University of Salento , Via Monteroni , I-73100 Lecce , Italy
| | - Federica De Castro
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali , University of Salento , Via Monteroni , I-73100 Lecce , Italy
| | - Francesco P Fanizzi
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali , University of Salento , Via Monteroni , I-73100 Lecce , Italy
| | - Rosaria Rinaldi
- Dipartimento di Matematica e Fisica "Ennio De Giorgi" , University of Salento , Via Arnesano , 73100 Lecce , Italy
- Scuola Superiore ISUFI , University of Salento , Via Monteroni, University Campus , 73100 Lecce , Italy
| |
Collapse
|
6
|
|
7
|
Benedetti M, De Castro F, Lamacchia V, Pacifico C, Natile G, Fanizzi FP. Insertion of terminal alkyne into Pt-N bond of the square planar [PtI 2(Me 2phen)] complex. Dalton Trans 2017; 46:15819-15826. [PMID: 29099524 DOI: 10.1039/c7dt03644b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactivity of [PtX2(Me2phen)] complexes (X = Cl, Br, I; Me2phen = 2,9-dimethyl-1,10-phenanthroline) with terminal alkynes has been investigated. Although the dichlorido species [PtCl2(Me2phen)] exhibits negligible reactivity, the bromido and iodido derivatives lead in short time to the formation of five-coordinate Pt(ii) complexes of the type [PtX2(Me2phen)(η2-CH[triple bond, length as m-dash]CR)] (X = Br, I; R = Ph, n-Bu), in equilibrium with the starting reagents. Similar to analogous complexes with simple acetylene, the five coordinate species can also undergo dissociation of an halido ligand and formation of the transient square-planar cationic species [PtX(Me2phen)(η2-CH[triple bond, length as m-dash]CR)]+. This latter can further evolve to give an unusual, sparingly soluble square planar product where the former terminal alkyne is converted into a :C[double bond, length as m-dash]C(H)(R) moiety with the α-carbon bridging the Pt(ii) core with one of the two N-donors of coordinated Me2phen. The final product [PtX2{κ2-N,C-(Z)-N[combining low line]1-N10-C[combining low line][double bond, length as m-dash]C(H)(R)}] (N1-N10 = 2,9-dimethyl-1,10-phenanthroline; X = Br, I) contains a Pt-N-C-C-N-C six-membered chelate ring in a square planar Pt(ii) coordination environment.
Collapse
Affiliation(s)
- Michele Benedetti
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Via Monteroni, I-73100 Lecce, Italy.
| | | | | | | | | | | |
Collapse
|
8
|
Benedetti M, De Castro F, Fanizzi FP. 73Ge, 119Sn and 207Pb: general cooperative effects of single atom ligands on the NMR signals observed in tetrahedral [MX nY 4-n] (M = Ge, Sn, Pb; 1 ≤ n ≤ 4; X, Y = Cl, Br, I) coordination compounds of heavier XIV group elements. Dalton Trans 2017; 46:2855-2860. [PMID: 28181618 DOI: 10.1039/c7dt00307b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An inverse linear relationship between 73Ge, 119Sn and 207Pb NMR chemical shifts and the overall sum of ionic radii of coordinated halido ligands has been discovered in tetrahedral [MXnY4-n] (M = Ge, Sn, Pb; 1 ≤ n ≤ 4; X, Y = Cl, Br, I) coordination compounds. This finding is consistent with a previously reported correlation found in octahedral, pentacoordinate and square planar platinum complexes. The effect of the coordinated halido ligands acting on the metal as shielding conducting rings is therefore confirmed also by 73Ge, 119Sn and 207Pb NMR spectroscopy.
Collapse
Affiliation(s)
- M Benedetti
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Via Monteroni, I-73100 Lecce, Italy.
| | - F De Castro
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Via Monteroni, I-73100 Lecce, Italy.
| | - F P Fanizzi
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Via Monteroni, I-73100 Lecce, Italy.
| |
Collapse
|
9
|
Benedetti M, De Castro F, Fanizzi FP. Square-Planar PtIIversus Octahedral PtIVHalido Complexes:195Pt NMR Explained by a Simple Empirical Approach. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600573] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Michele Benedetti
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali; Università del Salento; Via Monteroni 73100 Lecce Italy
| | - Federica De Castro
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali; Università del Salento; Via Monteroni 73100 Lecce Italy
| | - Francesco P. Fanizzi
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali; Università del Salento; Via Monteroni 73100 Lecce Italy
| |
Collapse
|
10
|
Benedetti M, Romano A, De Castro F, Girelli CR, Antonucci D, Migoni D, Verri T, Fanizzi FP. N7-platinated ribonucleotides are not incorporated by RNA polymerases. New perspectives for a rational design of platinum antitumor drugs. J Inorg Biochem 2016; 163:143-146. [PMID: 27421694 DOI: 10.1016/j.jinorgbio.2016.07.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Revised: 06/24/2016] [Accepted: 07/07/2016] [Indexed: 12/31/2022]
Abstract
In this work, we assessed the capacity of RNA polymerases to use platinated ribonucleotides as substrates for RNA synthesis by testing the incorporation of the model compound [Pt(dien)(N7-5'-GTP)] (dien=diethylenetriamine; GTP=5'-guanosine triphosphate) into a natural RNA sequence. The yield of in vitro transcription operated by T7 RNA polymerase, on the LacZ (Escherichia coli gene encoding for β-galactosidase) sequence, decreases progressively with decreasing the concentration of natural GTP, in favor of the platinated nucleotide, [Pt(dien)(N7-5'-GTP)]. Comparison of the T7 RNA polymerase transcription activities for [Pt(dien)(N7-5'-GTP)] compound incorporation reaction test, with respect to the effect of a decreasing concentration of natural GTP, showed no major differences. A specific inhibitory effect of compound [Pt(dien)(N7-5'-GTP)] (which may pair the complementary base on the DNA strand, without being incorporated in the RNA by the T7 RNA polymerase) was evidenced. Our findings therefore suggest that RNA polymerases, unlike DNA polymerases, are unable to incorporate N7-platinated nucleotides into newly synthesized nucleic acids. In this respect, specifically designed N7-platinated nucleotides based compounds could be used in alternative to the classical platinum based drugs. This approach may offer a possible strategy to target specifically DNA, without affecting RNA, and is potentially able to better modulate pharmacological activity.
Collapse
Affiliation(s)
- Michele Benedetti
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Via Monteroni, I-73100 Lecce, Italy.
| | - Alessandro Romano
- Neuropathology Unit, Institute of Experimental Neurology and Division of Neuroscience, IRCCS San Raffaele Scientific Institute, via Olgettina 60, 20132 Milan, Italy
| | - Federica De Castro
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Via Monteroni, I-73100 Lecce, Italy
| | - Chiara R Girelli
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Via Monteroni, I-73100 Lecce, Italy
| | - Daniela Antonucci
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Via Monteroni, I-73100 Lecce, Italy
| | - Danilo Migoni
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Via Monteroni, I-73100 Lecce, Italy
| | - Tiziano Verri
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Via Monteroni, I-73100 Lecce, Italy
| | - Francesco P Fanizzi
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Via Monteroni, I-73100 Lecce, Italy.
| |
Collapse
|
11
|
Five Coordinate Platinum(II) in [Pt(bpy)(cod)(Me)][SbF6]: A Structural and Spectroscopic Study. INORGANICS 2015. [DOI: 10.3390/inorganics3020118] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
|
12
|
Benedetti M, Lamacchia V, Antonucci D, Papadia P, Pacifico C, Natile G, Fanizzi FP. Insertion of alkynes into Pt-X bonds of square planar [PtX2(N^N)] (X = Cl, Br, I) complexes. Dalton Trans 2015; 43:8826-34. [PMID: 24782043 DOI: 10.1039/c4dt00679h] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The reactivity with acetylene of [PtX2(Me2phen)] (X = Cl, Br, I) complexes has been investigated. Whereas the chlorido species [PtCl2(Me2phen)] exhibits negligible reactivity at short reaction times, the bromido and iodido species [PtBr2(Me2phen)] and [PtI2(Me2phen)] lead initially to formation of Pt(II) five-coordinate complexes, [PtX2(η(2)-CH≡CH)(Me2phen)], that evolve to four-coordinate alkenyl complexes of the type [PtX(η(1)-E-CH=CHX)(Me2phen)]. The alkenyl complexes, in the presence of excess acetylene, establish an equilibrium with the five-coordinate alkyne-alkenyl species [PtX(η(1)-E-CH=CHX)(η(2)-CH≡CH)(Me2phen)] (X = Br, I). The π-bonded acetylene can be exchanged with free olefins or C≡O, affording the new alkene-alkenyl or carbonyl-alkenyl complexes [PtX(η(1)-E-CH=CHX)(η(2)-olefin)(Me2phen)] and [PtX(η(1)-E-CH=CHX)(C≡O)(Me2phen)]. The five-coordinate geometry of the alkyne-alkenyl and alkene-alkenyl complexes was assessed from NMR data and is fully consistent with that of a previously determined X-ray structure of [PtBr(η(1)-E-CH[double bond, length as m-dash]CHBr)(η(2)-CH2=CH2)(Me2phen)].
Collapse
Affiliation(s)
- Michele Benedetti
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Via Monteroni, I-73100 Lecce, Italy.
| | | | | | | | | | | | | |
Collapse
|
13
|
Benedetti M, Antonucci D, Girelli CR, Fanizzi FP. Hindrance, Donor Ability of Me
n
∩
NN
Chelates and Overall Stability of Pentacoordinate [PtCl
2
(η
2
‐CH
2
=CH
2
)(Me
n
∩
NN
)] Complexes as Observed by η
2
‐Olefin
1
J
Pt,C
Modulation: An NMR Study. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500103] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Michele Benedetti
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, via Monteroni, 73100 Lecce, Italy, http://www.unisalento.it/web/guest/home_page
| | - Daniela Antonucci
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, via Monteroni, 73100 Lecce, Italy, http://www.unisalento.it/web/guest/home_page
| | - Chiara R. Girelli
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, via Monteroni, 73100 Lecce, Italy, http://www.unisalento.it/web/guest/home_page
| | - Francesco P. Fanizzi
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, via Monteroni, 73100 Lecce, Italy, http://www.unisalento.it/web/guest/home_page
| |
Collapse
|
14
|
X-ray structures versus NMR signals in pentacoordinate [PtX2(η2-CH2CH2)(Me2phen)] (X=Cl, Br, I) complexes. Inorganica Chim Acta 2015. [DOI: 10.1016/j.ica.2015.01.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
15
|
Benedetti M, de Castro F, Antonucci D, Papadia P, Fanizzi FP. General cooperative effects of single atom ligands on a metal: a195Pt NMR chemical shift as a function of coordinated halido ligands’ ionic radii overall sum. Dalton Trans 2015; 44:15377-81. [DOI: 10.1039/c5dt02285a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An inverse linear relationship between the experimentally observed195Pt NMR signals and the overall sum of coordinated halido X ligands’ ionic radii was discovered in Pt(ii) and Pt(iv) complexes.
Collapse
Affiliation(s)
- M. Benedetti
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali
- Università del Salento
- I-73100 Lecce
- Italy
| | - F. de Castro
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali
- Università del Salento
- I-73100 Lecce
- Italy
| | - D. Antonucci
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali
- Università del Salento
- I-73100 Lecce
- Italy
| | - P. Papadia
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali
- Università del Salento
- I-73100 Lecce
- Italy
| | - F. P. Fanizzi
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali
- Università del Salento
- I-73100 Lecce
- Italy
| |
Collapse
|
16
|
Benedetti M, Girelli CR, Antonucci D, Fanizzi FP. [PtCl(η1-CH2–CH2OR)(NˆN)] and [PtCl(η2-CH2CH2)(NˆN)]+, NˆN = dinitrogen ligand, complexes. Sterical and electronic effects evidenced by NMR analysis. J Organomet Chem 2014. [DOI: 10.1016/j.jorganchem.2014.05.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
17
|
New method for the synthesis of [PtCl{η1-CH2C(O)R}(N-N)] ketonyl derivatives starting from the Zeise’s salt. Inorganica Chim Acta 2014. [DOI: 10.1016/j.ica.2013.12.044] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
18
|
Benedetti M, Barone CR, Girelli CR, Fanizzi FP, Natile G, Maresca L. H/D exchange at sp3 carbons in the coordination sphere of platinum(ii). Dalton Trans 2014; 43:3669-75. [DOI: 10.1039/c3dt53216j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Michele Benedetti
- Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, Via Monteroni, I-73100 Lecce, Italy.
| | | | | | | | | | | |
Collapse
|