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Zhang S, Lloveras V, Wu Y, Tolosa J, García-Martínez JC, Vidal-Gancedo J. Fluorescent and Magnetic Radical Dendrimers as Potential Bimodal Imaging Probes. Pharmaceutics 2023; 15:1776. [PMID: 37376224 DOI: 10.3390/pharmaceutics15061776] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 06/05/2023] [Accepted: 06/09/2023] [Indexed: 06/29/2023] Open
Abstract
Dual or multimodal imaging probes have emerged as powerful tools that improve detection sensitivity and accuracy in disease diagnosis by imaging techniques. Two imaging techniques that are complementary and do not use ionizing radiation are magnetic resonance imaging (MRI) and optical fluorescence imaging (OFI). Herein, we prepared metal-free organic species based on dendrimers with magnetic and fluorescent properties as proof-of-concept of bimodal probes for potential MRI and OFI applications. We used oligo(styryl)benzene (OSB) dendrimers core that are fluorescent on their own, and TEMPO organic radicals anchored on their surfaces, as the magnetic component. In this way, we synthesized six radical dendrimers and characterized them by FT-IR, 1H NMR, UV-Vis, MALDI-TOF, SEC, EPR, fluorimetry, and in vitro MRI. Importantly, it was demonstrated that the new dendrimers present two properties: on one hand, they are paramagnetic and show the ability to generate contrast by MRI in vitro, and, on the other hand, they also show fluoresce emission. This is a remarkable result since it is one of the very few cases of macromolecules with bimodal magnetic and fluorescent properties using organic radicals as the magnetic probe.
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Affiliation(s)
- Songbai Zhang
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Vega Lloveras
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain
- CIBER de Bioingeniería, Biomateriales y Nanomedicina, Instituto de Salud Carlos III, Campus UAB, 08193 Bellaterra, Spain
| | - Yufei Wu
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain
| | - Juan Tolosa
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Farmacia, Universidad de Castilla-La Mancha, C/José María Sánchez Ibáñez s/n, 02008 Albacete, Spain
- Regional Center for Biomedical Research (CRIB), Universidad de Castilla-La Mancha, C/Almansa 13, 02008 Albacete, Spain
| | - Joaquín C García-Martínez
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Farmacia, Universidad de Castilla-La Mancha, C/José María Sánchez Ibáñez s/n, 02008 Albacete, Spain
- Regional Center for Biomedical Research (CRIB), Universidad de Castilla-La Mancha, C/Almansa 13, 02008 Albacete, Spain
| | - José Vidal-Gancedo
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain
- CIBER de Bioingeniería, Biomateriales y Nanomedicina, Instituto de Salud Carlos III, Campus UAB, 08193 Bellaterra, Spain
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2
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Köber M, Illa-Tuset S, Ferrer-Tasies L, Moreno-Calvo E, Tatkiewicz WI, Grimaldi N, Piña D, Pérez Pérez A, Lloveras V, Vidal-Gancedo J, Bulone D, Ratera I, Skov Pedersenc J, Danino D, Veciana J, Faraudo J, Ventosa N. Stable nanovesicles formed by intrinsically planar bilayers. J Colloid Interface Sci 2022; 631:202-211. [DOI: 10.1016/j.jcis.2022.10.104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 10/16/2022] [Accepted: 10/20/2022] [Indexed: 11/06/2022]
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3
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Zhang S, Lloveras V, Lope-Piedrafita S, Calero-Pérez P, Wu S, Candiota AP, Vidal-Gancedo J. Metal-Free Radical Dendrimers as MRI Contrast Agents for Glioblastoma Diagnosis: Ex Vivo and In Vivo Approaches. Biomacromolecules 2022; 23:2767-2777. [PMID: 35749573 PMCID: PMC9277593 DOI: 10.1021/acs.biomac.2c00088] [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: 01/21/2023]
Abstract
![]()
Simultaneously being
a nonradiative and noninvasive technique makes
magnetic resonance imaging (MRI) one of the highly required imaging
approaches for the early diagnosis and follow-up of tumors, specifically
for brain cancer. Paramagnetic gadolinium (Gd)-based contrast agents
(CAs) are the most widely used ones in brain MRI acquisitions with
special interest when assessing blood–brain barrier (BBB) integrity,
a characteristic of high-grade tumors. However, alternatives to Gd-based
contrast agents (CAs) are highly required to overcome their established
toxicity. Organic radicals anchored on a dendrimer macromolecule surface
(radical dendrimers) are promising alternatives since they also exhibit
paramagnetic properties and can act as T1 CAs like Gd-based CAs while being organic species (mitigating concerns
about toxic metal accumulation). Here, we studied the third generation
of a water-soluble family of poly(phosphorhydrazone) radical dendrimers,
with 48 PROXYL radical units anchored on their branches, exploring
their potential of ex vivo and in vivo contrast enhancement in brain tumors (in particular, of immunocompetent,
orthotopic GL261 murine glioblastoma (GB)). Remarkably, this radical
species provides suitable contrast enhancement on murine GL261 GB
tumors, which was comparable to that of commercial Gd-based CAs (at
standard dose 0.1 mmol/kg), even at its 4 times lower administered
dose (0.025 mmol/kg). Importantly, no signs of toxicity were detected in vivo. In addition, it showed a selective accumulation
in brain tumor tissues, exhibiting longer retention within the tumor,
which allows performing imaging acquisition over longer time frames
(≥2.5 h) as opposed to Gd chelates. Finally, we observed high
stability of the radicals in biological media, on the order of hours
instead of minutes, characteristic of the isolated radicals. All of
these features allow us to suggest that the G3-Tyr-PROXYL-ONa radical
dendrimer could be a viable alternative to metal-based MRI contrast
agents, particularly on MRI analysis of GB, representing, to the best
of our knowledge, the first case of organic radical species used for
this purpose and one of the very few examples of these types of radical
species working as MRI CAs in vivo.
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Affiliation(s)
- Songbai Zhang
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC; Campus UAB, 08193 Bellaterra, Spain
| | - Vega Lloveras
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC; Campus UAB, 08193 Bellaterra, Spain.,CIBER de Bioingeniería, Biomateriales y Nanomedicina, Instituto de Salud Carlos III, Campus UAB, 08913 Bellaterra, Spain
| | - Silvia Lope-Piedrafita
- CIBER de Bioingeniería, Biomateriales y Nanomedicina, Instituto de Salud Carlos III, Campus UAB, 08913 Bellaterra, Spain.,Servei de Ressonància Magnètica Nuclear, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
| | - Pilar Calero-Pérez
- CIBER de Bioingeniería, Biomateriales y Nanomedicina, Instituto de Salud Carlos III, Campus UAB, 08913 Bellaterra, Spain.,Departament de Bioquímica i Biologia Molecular, Unitat de Bioquímica de Biociències, Edifici Cs, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
| | - Shuang Wu
- Departament de Bioquímica i Biologia Molecular, Unitat de Bioquímica de Biociències, Edifici Cs, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
| | - Ana Paula Candiota
- CIBER de Bioingeniería, Biomateriales y Nanomedicina, Instituto de Salud Carlos III, Campus UAB, 08913 Bellaterra, Spain.,Departament de Bioquímica i Biologia Molecular, Unitat de Bioquímica de Biociències, Edifici Cs, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain.,Institut de Biotecnologia i de Biomedicina (IBB), Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
| | - José Vidal-Gancedo
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC; Campus UAB, 08193 Bellaterra, Spain.,CIBER de Bioingeniería, Biomateriales y Nanomedicina, Instituto de Salud Carlos III, Campus UAB, 08913 Bellaterra, Spain
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4
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Lloveras V, Elías-Rodríguez P, Bursi L, Shirdel E, Goñi AR, Calzolari A, Vidal-Gancedo J. Multifunctional Switch Based on Spin-Labeled Gold Nanoparticles. Nano Lett 2022; 22:768-774. [PMID: 35078323 DOI: 10.1021/acs.nanolett.1c04294] [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] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The fabrication of multifunctional switches is a fundamental step in the development of nanometer-scale molecular spintronic devices. The anchoring of active organic radicals on gold nanoparticles (AuNPs) surface is little studied and the realization of AuNPs-based switches remains extremely challenging. We report the first demonstration of a surface molecular switch based on AuNPs decorated with persistent perchlorotriphenylmethyl (PTM) radicals. The redox properties of PTM are exploited to fabricate electrochemical switches with optical and magnetic responses, showing high stability and reversibility. Electronic interaction between the radicals and the gold surface is investigated by UV-vis, showing a very broad absorption band in the near-infrared (NIR) region, which becomes more intense when PTMs are reduced to anionic phase. By using multiple experimental techniques, we demonstrate that this interaction is likely favored by the preferentially flat orientation of PTM ligands on the metallic NP surface, as confirmed by first-principles simulations.
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Affiliation(s)
- Vega Lloveras
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Catalonia Spain
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), E-08193 Barcelona, Spain
| | - Pilar Elías-Rodríguez
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Catalonia Spain
| | - Luca Bursi
- CNR-NANO Istituto Nanoscienze, Centro S3, I-41125 Modena, Italy
| | - Ehsan Shirdel
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Catalonia Spain
| | - Alejandro R Goñi
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Catalonia Spain
- ICREA, Passeig Lluís Companys 23, 08010 Barcelona, Spain
| | | | - José Vidal-Gancedo
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Catalonia Spain
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), E-08193 Barcelona, Spain
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5
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Medina Rivero S, Urieta‐Mora J, Molina‐Ontoria A, Martín‐Fuentes C, Urgel JI, Zubiria‐Ulacia M, Lloveras V, Casanova D, Martínez JI, Veciana J, Écija D, Martín N, Casado J. A Trapezoidal Octacyanoquinoid Acceptor Forms Solution and Surface Products by Antiparallel Shape Fitting with Conformational Dipole Momentum Switch. Angew Chem Int Ed Engl 2021; 60:17887-17892. [PMID: 34086392 PMCID: PMC8456967 DOI: 10.1002/anie.202104294] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 03/27/2021] [Indexed: 11/13/2022]
Abstract
A new compound (1) formed by two antiparallelly disposed tetracyano thienoquinoidal units has been synthesized and studied by electrochemistry, UV/Vis-NIR, IR, EPR, and transient spectroscopy. Self-assembly of 1 on a Au(111) surface has been investigated by scanning tunneling microscopy. Experiments have been rationalized by quantum chemical calculations. 1 exhibits a unique charge distribution in its anionic form, with a gradient of charge yielding a neat molecular in-plane electric dipole momentum, which transforms out-of-plane after surface deposition due to twisted→folded conformational change and to partial charge transfer from Au(111). Intermolecular van der Waals interactions and antiparallel trapezoidal shape fitting lead to the formation of an optimal dense on Au(111) two-dimensional assembly of 1.
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Affiliation(s)
- Samara Medina Rivero
- Department of Physical ChemistryUniversity of MálagaAndalucia-Tech Campus de Teatinos s/n29071MálagaSpain
| | - Javier Urieta‐Mora
- IMDEA-Nanociencia, C/Faraday 9Ciudad Universitaria de Cantoblanco28049MadridSpain
- Department of Organic ChemistryFaculty of ChemistryComplutense University of Madrid28040MadridSpain
| | | | | | - José I. Urgel
- IMDEA-Nanociencia, C/Faraday 9Ciudad Universitaria de Cantoblanco28049MadridSpain
| | - Maria Zubiria‐Ulacia
- DonostiaInternational Physics Center (DIPC) & IKERBASQUE—Basque Foundation for SciencePaseo Manuel de Lardizabal, 420018Donostia-San SebastiánEuskadiSpain
| | - Vega Lloveras
- Department of Molecular Nanoscience and Organic MaterialsInstitut de Ciència de Materials de Barcelona (ICMAB-CSIC) and Networking Research Center on BioengineeringBiomaterials and Nanomedicine (CIBER-BBN)Campus de la UAB08193BellaterraSpain
| | - David Casanova
- DonostiaInternational Physics Center (DIPC) & IKERBASQUE—Basque Foundation for SciencePaseo Manuel de Lardizabal, 420018Donostia-San SebastiánEuskadiSpain
| | - José I. Martínez
- Department of Nanostructures and Low-dimensional MaterialsInstitute of Materials Science of Madrid (ICMM-CSIC)Ciudad Universitaria de CantoblancoC/Sor Juana Inés de la Cruz 328049MadridSpain
| | - Jaume Veciana
- Department of Molecular Nanoscience and Organic MaterialsInstitut de Ciència de Materials de Barcelona (ICMAB-CSIC) and Networking Research Center on BioengineeringBiomaterials and Nanomedicine (CIBER-BBN)Campus de la UAB08193BellaterraSpain
| | - David Écija
- IMDEA-Nanociencia, C/Faraday 9Ciudad Universitaria de Cantoblanco28049MadridSpain
| | - Nazario Martín
- IMDEA-Nanociencia, C/Faraday 9Ciudad Universitaria de Cantoblanco28049MadridSpain
- Department of Organic ChemistryFaculty of ChemistryComplutense University of Madrid28040MadridSpain
| | - Juan Casado
- Department of Physical ChemistryUniversity of MálagaAndalucia-Tech Campus de Teatinos s/n29071MálagaSpain
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6
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Medina Rivero S, Urieta‐Mora J, Molina‐Ontoria A, Martín‐Fuentes C, Urgel JI, Zubiria‐Ulacia M, Lloveras V, Casanova D, Martínez JI, Veciana J, Écija D, Martín N, Casado J. A Trapezoidal Octacyanoquinoid Acceptor Forms Solution and Surface Products by Antiparallel Shape Fitting with Conformational Dipole Momentum Switch. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202104294] [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: 11/10/2022]
Affiliation(s)
- Samara Medina Rivero
- Department of Physical Chemistry University of Málaga Andalucia-Tech Campus de Teatinos s/n 29071 Málaga Spain
| | - Javier Urieta‐Mora
- IMDEA-Nanociencia, C/Faraday 9 Ciudad Universitaria de Cantoblanco 28049 Madrid Spain
- Department of Organic Chemistry Faculty of Chemistry Complutense University of Madrid 28040 Madrid Spain
| | | | | | - José I. Urgel
- IMDEA-Nanociencia, C/Faraday 9 Ciudad Universitaria de Cantoblanco 28049 Madrid Spain
| | - Maria Zubiria‐Ulacia
- Donostia International Physics Center (DIPC) & IKERBASQUE—Basque Foundation for Science Paseo Manuel de Lardizabal, 4 20018 Donostia-San Sebastián Euskadi Spain
| | - Vega Lloveras
- Department of Molecular Nanoscience and Organic Materials Institut de Ciència de Materials de Barcelona (ICMAB-CSIC) and Networking Research Center on Bioengineering Biomaterials and Nanomedicine (CIBER-BBN) Campus de la UAB 08193 Bellaterra Spain
| | - David Casanova
- Donostia International Physics Center (DIPC) & IKERBASQUE—Basque Foundation for Science Paseo Manuel de Lardizabal, 4 20018 Donostia-San Sebastián Euskadi Spain
| | - José I. Martínez
- Department of Nanostructures and Low-dimensional Materials Institute of Materials Science of Madrid (ICMM-CSIC) Ciudad Universitaria de Cantoblanco C/Sor Juana Inés de la Cruz 3 28049 Madrid Spain
| | - Jaume Veciana
- Department of Molecular Nanoscience and Organic Materials Institut de Ciència de Materials de Barcelona (ICMAB-CSIC) and Networking Research Center on Bioengineering Biomaterials and Nanomedicine (CIBER-BBN) Campus de la UAB 08193 Bellaterra Spain
| | - David Écija
- IMDEA-Nanociencia, C/Faraday 9 Ciudad Universitaria de Cantoblanco 28049 Madrid Spain
| | - Nazario Martín
- IMDEA-Nanociencia, C/Faraday 9 Ciudad Universitaria de Cantoblanco 28049 Madrid Spain
- Department of Organic Chemistry Faculty of Chemistry Complutense University of Madrid 28040 Madrid Spain
| | - Juan Casado
- Department of Physical Chemistry University of Málaga Andalucia-Tech Campus de Teatinos s/n 29071 Málaga Spain
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7
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Mayorga-Burrezo P, Bejarano F, Calbo J, Zhao X, De Sousa JA, Lloveras V, Bryce MR, Ortí E, Veciana J, Rovira C, Crivillers N. Allocation of Ambipolar Charges on an Organic Diradical with a Vinylene-Phenylenediyne Bridge. J Phys Chem Lett 2021; 12:6159-6164. [PMID: 34184906 DOI: 10.1021/acs.jpclett.1c01565] [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: 06/13/2023]
Abstract
Two redox and magnetically active perchlorotriphenylmethyl (•PTM) radical units have been connected as end-capping groups to a bis(phenylene)diyne chain through vinylene linkers. Negative and positive charged species have been generated, and the influence of the bridge on their stabilization is discussed. Partial reduction of the electron-withdrawing •PTM radicals results in a class-II mixed-valence system with the negative charge located on the terminal PTM units, proving the efficiency of the conjugated chain for the electron transport between the two terminal sites. Counterintuitively, the oxidation process does not occur along the electron-rich bridge but on the vinylene units. The •PTM radicals play a key role in the stabilization of the cationic species, promoting the generation of quinoidal ring segments.
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Affiliation(s)
- Paula Mayorga-Burrezo
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Spain
| | - Francesc Bejarano
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Spain
| | - Joaquín Calbo
- Instituto de Ciencia Molecular, Universidad de Valencia, Catedrático José Beltrán, 2, 46980 Paterna, Spain
| | - Xiaotao Zhao
- Chemistry Department, Durham University, Durham DH1 3LE, United Kingdom
| | - J Alejandro De Sousa
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Spain
- Laboratorio de Electroquímica, Departamento de Química, Facultad de Ciencias, Universidad de los Andes, 5101 Mérida, Venezuela
| | - Vega Lloveras
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Spain
| | - Martin R Bryce
- Chemistry Department, Durham University, Durham DH1 3LE, United Kingdom
| | - Enrique Ortí
- Instituto de Ciencia Molecular, Universidad de Valencia, Catedrático José Beltrán, 2, 46980 Paterna, Spain
| | - Jaume Veciana
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Spain
| | - Concepció Rovira
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Spain
| | - Núria Crivillers
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Spain
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8
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Abstract
The search for new biomedical applications of dendrimers has promoted the synthesis of new radical-based molecules. Specifically, obtaining radical dendrimers has opened the door to their use in various fields such as magnetic resonance imaging, as anti-tumor or antioxidant agents, or the possibility of developing new types of devices based on the paramagnetic properties of organic radicals. Herein, we present a mini review of radical dendrimers based on polyphosphorhydrazone, a new type of macromolecule with which, thanks to their versatility, new metal-free contrast agents are being obtained, among other possible applications.
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Affiliation(s)
- Vega Lloveras
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC) and CIBER-BBN, Campus UAB, 08193 Bellaterra, Spain
| | - José Vidal-Gancedo
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC) and CIBER-BBN, Campus UAB, 08193 Bellaterra, Spain
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9
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Jiménez VG, Mayorga-Burrezo P, Blanco V, Lloveras V, Gómez-García CJ, Šolomek T, Cuerva JM, Veciana J, Campaña AG. Dibenzocycloheptatriene as end-group of Thiele and tetrabenzo-Chichibabin hydrocarbons. Chem Commun (Camb) 2020; 56:12813-12816. [PMID: 32966400 DOI: 10.1039/d0cc04489j] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Thiele (Th) and tetrabenzo-Chichibabin (TBC) derivatives with terminal dibenzocycloheptatriene (DBHept) units were prepared. A clear correlation between their electronic and molecular structures was stablished. Insights into their closed- or open-shell ground states were gained, where particular contribution of the heptagonal carbocycles as end-groups was proved. Remarkably, a thermally accessible triplet diradical configuration was confirmed for the DBHept-TBC compound.
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Affiliation(s)
- Vicente G Jiménez
- Department of Organic Chemistry, Unidad de Excelencia de Química aplicada a Biomedicina y Medio Ambiente, University of Granada (UGR), C. U. Fuentenueva, Granada 18071, Spain.
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10
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Badetti E, Lloveras V, Amadio E, Di Lorenzo R, Olivares-Marín M, Tesio AY, Zhang S, Pan F, Rissanen K, Veciana J, Tonti D, Vidal-Gancedo J, Zonta C, Licini G. Organic Polyradicals as Redox Mediators: Effect of Intramolecular Radical Interactions on Their Efficiency. ACS Appl Mater Interfaces 2020; 12:45968-45975. [PMID: 32930562 PMCID: PMC8011802 DOI: 10.1021/acsami.0c09386] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
The spin-spin interactions between unpaired electrons in organic (poly)radicals, especially nitroxides, are largely investigated and are of crucial importance for their applications in areas such as organic magnetism, molecular charge transfer, or multiple spin labeling in structural biology. Recently, 2,2,6,6-tetramethylpiperidinyloxyl and polymers functionalized with nitroxides have been described as successful redox mediators in several electrochemical applications; however, the study of spin-spin interaction effect in such an area is absent. This communication reports the preparation of a novel family of discrete polynitroxide molecules, with the same number of radical units but different arrangements to study the effect of intramolecular spin-spin interactions on their electrochemical potential and their use as oxidation redox mediators in a Li-oxygen battery. We find that the intensity of interactions, as measured by the d1/d electron paramagnetic resonance parameter, progressively lowers the reduction potential. This allows us to tune the charging potential of the battery, optimizing its energy efficiency.
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Affiliation(s)
- Elena Badetti
- Department of Chemical Sciences and CIRCC Padova Unit, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Vega Lloveras
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus Universitari de Bellaterra, E-08193 Cerdanyola del Vallès, Spain
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), E-08193 Barcelona, Spain
| | - Emanuele Amadio
- Department of Chemical Sciences and CIRCC Padova Unit, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Rosalia Di Lorenzo
- Department of Chemical Sciences and CIRCC Padova Unit, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Mara Olivares-Marín
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus Universitari de Bellaterra, E-08193 Cerdanyola del Vallès, Spain
- Department of Mechanical, Energy and Materials Engineering, University Centre of Mérida, University of Extremadura, Avda. Santa Teresa de Jornet, 38, 06800 Mérida, Spain
| | - Alvaro Y Tesio
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus Universitari de Bellaterra, E-08193 Cerdanyola del Vallès, Spain
- Centro de Investigación y Desarrollo en Materiales Avanzados y Almacenamiento de Energía de Jujuy (CIDMEJu), Centro de Desarrollo Tecnológico General Manuel Savio, Av. Martijena S/N, Palpalá Y 4612, Jujuy, Argentina
| | - Songbai Zhang
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus Universitari de Bellaterra, E-08193 Cerdanyola del Vallès, Spain
| | - Fangfang Pan
- Department of Chemistry, University of Jyvaskyla, P. O. Box 35, 40014 Jyväskylä, Finland
| | - Kari Rissanen
- Department of Chemistry, University of Jyvaskyla, P. O. Box 35, 40014 Jyväskylä, Finland
| | - Jaume Veciana
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus Universitari de Bellaterra, E-08193 Cerdanyola del Vallès, Spain
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), E-08193 Barcelona, Spain
| | - Dino Tonti
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus Universitari de Bellaterra, E-08193 Cerdanyola del Vallès, Spain
| | - Jose Vidal-Gancedo
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus Universitari de Bellaterra, E-08193 Cerdanyola del Vallès, Spain
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), E-08193 Barcelona, Spain
| | - Cristiano Zonta
- Department of Chemical Sciences and CIRCC Padova Unit, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Giulia Licini
- Department of Chemical Sciences and CIRCC Padova Unit, University of Padova, Via Marzolo 1, 35131 Padova, Italy
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11
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Zhang S, Lloveras V, Pulido D, Liko F, Pinto LF, Albericio F, Royo M, Vidal-Gancedo J. Radical Dendrimers Based on Biocompatible Oligoethylene Glycol Dendrimers as Contrast Agents for MRI. Pharmaceutics 2020; 12:E772. [PMID: 32823903 PMCID: PMC7464757 DOI: 10.3390/pharmaceutics12080772] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [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: 06/12/2020] [Revised: 07/23/2020] [Accepted: 08/03/2020] [Indexed: 11/27/2022] Open
Abstract
Finding alternatives to gadolinium (Gd)-based contrast agents (CA) with the same or even better paramagnetic properties is crucial to overcome their established toxicity. Herein we describe the synthesis and characterization of entirely organic metal-free paramagnetic macromolecules based on biocompatible oligoethylene glycol dendrimers fully functionalized with 5 and 20 organic radicals (OEG Gn-PROXYL (n = 0, 1) radical dendrimers) with the aim to be used as magnetic resonance imaging (MRI) contrast agents. Conferring high water solubility on such systems is often a concern, especially in large generation dendrimers. Our approach to overcome such an issue in this study is by synthesizing dendrimers with highly water-soluble branches themselves. In this work, we show that the highly water-soluble OEG Gn-PROXYL (n = 0, 1) radical dendrimers obtained showed properties that convert them in good candidates to be studied as contrast agents for MRI applications like diagnosis and follow-up of infectious diseases, among others. Importantly, with the first generation radical dendrimer, a similar r1 relaxivity value (3.4 mM-1s-1) in comparison to gadolinium-diethylenetriamine pentaacetic acid (Gd-DTPA) used in clinics (3.2 mM-1s-1, r.t. 7T) has been obtained, and it has been shown to not be cytotoxic, avoiding the toxicity risks associated with the unwanted accumulation of Gd in the body.
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Affiliation(s)
- Songbai Zhang
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC) and CIBER-BBN, Campus Universitari de Bellaterra, Bellaterra, 08193 Barcelona, Spain; (S.Z.); (V.L.); (F.L.); (L.F.P.)
| | - Vega Lloveras
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC) and CIBER-BBN, Campus Universitari de Bellaterra, Bellaterra, 08193 Barcelona, Spain; (S.Z.); (V.L.); (F.L.); (L.F.P.)
| | - Daniel Pulido
- Institut de Química Avançada de Catalunya (IQAC-CSIC) and CIBER-BBN c/ Jordi Girona 18–26, 08034 Barcelona, Spain; (D.P.); (F.A.); (M.R.)
| | - Flonja Liko
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC) and CIBER-BBN, Campus Universitari de Bellaterra, Bellaterra, 08193 Barcelona, Spain; (S.Z.); (V.L.); (F.L.); (L.F.P.)
| | - Luiz F. Pinto
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC) and CIBER-BBN, Campus Universitari de Bellaterra, Bellaterra, 08193 Barcelona, Spain; (S.Z.); (V.L.); (F.L.); (L.F.P.)
| | - Fernando Albericio
- Institut de Química Avançada de Catalunya (IQAC-CSIC) and CIBER-BBN c/ Jordi Girona 18–26, 08034 Barcelona, Spain; (D.P.); (F.A.); (M.R.)
- Department of Inorganic and Organic Chemistry, University of Barcelona, 08028 Barcelona, Spain
- School of Chemistry and Physics, University of KwaZulu-Natal, Durban 4041, South Africa
| | - Miriam Royo
- Institut de Química Avançada de Catalunya (IQAC-CSIC) and CIBER-BBN c/ Jordi Girona 18–26, 08034 Barcelona, Spain; (D.P.); (F.A.); (M.R.)
| | - José Vidal-Gancedo
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC) and CIBER-BBN, Campus Universitari de Bellaterra, Bellaterra, 08193 Barcelona, Spain; (S.Z.); (V.L.); (F.L.); (L.F.P.)
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12
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Badetti E, Lloveras V, Scaramuzzo FA, Wurst K, Veciana J, Vidal-Gancedo J, Licini G, Zonta C. Tris-pyridylmethylamine (TPMA) complexes functionalized with persistent nitronyl nitroxide organic radicals. Dalton Trans 2020; 49:10011-10016. [PMID: 32643714 DOI: 10.1039/d0dt01553a] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The chance to have persistent organic radicals in combination with metals has attracted much interest since it offers the possibility of having new functional molecules with multiple open-shell elements. In this study, we report the synthesis of two tripodal tris(2-pyridyl)methylamine ligands (TPMA) functionalized with nitronyl nitroxide persistent radicals. The newly formed ligands have been used to coordinate zinc(ii), copper(ii), iron(ii) and cobalt(ii). The resulting complexes have been investigated by means of electron paramagnetic resonance (EPR), ESI-MS, FT-IR spectroscopy and X-ray diffraction. An electron reduction of the N-O radical moiety has been observed, depending on the metal used for the formation of the complex and the reaction conditions. We have observed small differences in the EPR spectra depending on the meta or para position of the radical moiety in the complex structure and some antiferromagnetic interactions between the paramagnetic M(ii) ions and the radical species.
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Affiliation(s)
- Elena Badetti
- Department of Chemical Sciences, University of Padova via Marzolo 1, 35131 Padova, Italy
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13
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Pinto LF, Lloveras V, Zhang S, Liko F, Veciana J, Muñoz-Gómez JL, Vidal-Gancedo J. Fully Water-Soluble Polyphosphorhydrazone-Based Radical Dendrimers Functionalized with Tyr-PROXYL Radicals as Metal-Free MRI T1 Contrast Agents. ACS Appl Bio Mater 2019; 3:369-376. [DOI: 10.1021/acsabm.9b00855] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Luiz F. Pinto
- Institut de Ciència de Materials de Barcelona ICMAB−CSIC; Campus UAB, E-08193 Bellaterra, Barcelona, Spain
- CIBER de Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN, E-08193, Barcelona, Spain
| | - Vega Lloveras
- Institut de Ciència de Materials de Barcelona ICMAB−CSIC; Campus UAB, E-08193 Bellaterra, Barcelona, Spain
- CIBER de Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN, E-08193, Barcelona, Spain
| | - Songbai Zhang
- Institut de Ciència de Materials de Barcelona ICMAB−CSIC; Campus UAB, E-08193 Bellaterra, Barcelona, Spain
| | - Flonja Liko
- Institut de Ciència de Materials de Barcelona ICMAB−CSIC; Campus UAB, E-08193 Bellaterra, Barcelona, Spain
| | - Jaume Veciana
- Institut de Ciència de Materials de Barcelona ICMAB−CSIC; Campus UAB, E-08193 Bellaterra, Barcelona, Spain
- CIBER de Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN, E-08193, Barcelona, Spain
| | - José L. Muñoz-Gómez
- Institut de Ciència de Materials de Barcelona ICMAB−CSIC; Campus UAB, E-08193 Bellaterra, Barcelona, Spain
| | - José Vidal-Gancedo
- Institut de Ciència de Materials de Barcelona ICMAB−CSIC; Campus UAB, E-08193 Bellaterra, Barcelona, Spain
- CIBER de Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN, E-08193, Barcelona, Spain
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14
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Lloveras V, Liko F, Pinto LF, Muñoz-Gómez JL, Veciana J, Vidal-Gancedo J. Tuning Spin-Spin Interactions in Radical Dendrimers. Chemphyschem 2018; 19:1895-1902. [PMID: 29744989 DOI: 10.1002/cphc.201800372] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [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: 04/23/2018] [Indexed: 12/15/2022]
Abstract
Two generations of polyphosphorhydrazone (PPH) dendrimers were synthesized and fully functionalized with TEMPO radicals via acrylamido or imino group linkers to evaluate the impact of the linker substitution on the radical-radical interactions. A drastic change in the way that the radicals interacted among them was observed by EPR and CV studies: while radicals in Gn -imino-TEMPO dendrimers presented a strong spin-spin interaction, in the Gn -acrylamido-TEMPO ones they acted mainly as independent radicals. This shows that these interactions could be tuned by the solely substitution of the radical linker, opening the perspective of controlling and modulating the extension of these interactions depending on each application. The chemical properties of the linker strongly influence the spin-spin exchange between pendant radicals.
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Affiliation(s)
- Vega Lloveras
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), campus universitari de Bellaterra, E-, 08193, Cerdanyola del Vallès, Spain
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona, Spain
| | - Flonja Liko
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), campus universitari de Bellaterra, E-, 08193, Cerdanyola del Vallès, Spain
| | - Luiz F Pinto
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), campus universitari de Bellaterra, E-, 08193, Cerdanyola del Vallès, Spain
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona, Spain
| | - José L Muñoz-Gómez
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), campus universitari de Bellaterra, E-, 08193, Cerdanyola del Vallès, Spain
| | - Jaume Veciana
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), campus universitari de Bellaterra, E-, 08193, Cerdanyola del Vallès, Spain
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona, Spain
| | - José Vidal-Gancedo
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), campus universitari de Bellaterra, E-, 08193, Cerdanyola del Vallès, Spain
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona, Spain
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15
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Franco C, Burrezo PM, Lloveras V, Caballero R, Alcón I, Bromley ST, Mas-Torrent M, Langa F, López Navarrete JT, Rovira C, Casado J, Veciana J. Operative Mechanism of Hole-Assisted Negative Charge Motion in Ground States of Radical-Anion Molecular Wires. J Am Chem Soc 2017; 139:686-692. [DOI: 10.1021/jacs.6b08649] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Carlos Franco
- Department
of Molecular Nanoscience and Organic Materials, Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)/CIBER-BBN, Campus Universitari de Bellaterra, Cerdanyola, E-08193 Barcelona, Spain
| | - Paula Mayorga Burrezo
- Department
of Physical Chemistry, University of Malaga, Campus de Teatinos s/n, 29071 Malaga, Spain
| | - Vega Lloveras
- Department
of Molecular Nanoscience and Organic Materials, Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)/CIBER-BBN, Campus Universitari de Bellaterra, Cerdanyola, E-08193 Barcelona, Spain
| | - Rubén Caballero
- Instituto
de Nanociencia, Nanotecnología y Materiales Moleculares (INAMOL), University of Castilla-La Mancha, Campus de la Fábrica de Armas, 45071 Toledo, Spain
| | - Isaac Alcón
- Department
of Materials Science and Physical Chemistry, Faculty of Chemistry, University of Barcelona, Avenida Diagonal, 647, 08028 Barcelona, Spain
| | - Stefan T. Bromley
- Department
of Materials Science and Physical Chemistry, Faculty of Chemistry, University of Barcelona, Avenida Diagonal, 647, 08028 Barcelona, Spain
- Catalan Institution of Research and Advanced Studies (ICREA), 08010 Barcelona, Spain
| | - Marta Mas-Torrent
- Department
of Molecular Nanoscience and Organic Materials, Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)/CIBER-BBN, Campus Universitari de Bellaterra, Cerdanyola, E-08193 Barcelona, Spain
| | - Fernando Langa
- Instituto
de Nanociencia, Nanotecnología y Materiales Moleculares (INAMOL), University of Castilla-La Mancha, Campus de la Fábrica de Armas, 45071 Toledo, Spain
| | - Juan T. López Navarrete
- Department
of Physical Chemistry, University of Malaga, Campus de Teatinos s/n, 29071 Malaga, Spain
| | - Concepciò Rovira
- Department
of Molecular Nanoscience and Organic Materials, Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)/CIBER-BBN, Campus Universitari de Bellaterra, Cerdanyola, E-08193 Barcelona, Spain
| | - Juan Casado
- Department
of Physical Chemistry, University of Malaga, Campus de Teatinos s/n, 29071 Malaga, Spain
| | - Jaume Veciana
- Department
of Molecular Nanoscience and Organic Materials, Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)/CIBER-BBN, Campus Universitari de Bellaterra, Cerdanyola, E-08193 Barcelona, Spain
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16
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Pinto LF, Marín-Montesinos I, Lloveras V, Muñoz-Gómez JL, Pons M, Veciana J, Vidal-Gancedo J. NMR signal enhancement of >50 000 times in fast dissolution dynamic nuclear polarization. Chem Commun (Camb) 2017; 53:3757-3760. [DOI: 10.1039/c7cc00635g] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [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
A novel mixed biradical polarizing agent (BDPAesterTEMPO) showing one of the largest NMR signal enhancements to be observed so far in fast dissolution Dynamic Nuclear Polarization (dDNP).
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Affiliation(s)
- L. F. Pinto
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)
- Bellaterra
- Spain
- CIBER-BBN
- Barcelona
| | - I. Marín-Montesinos
- Biomolecular NMR laboratory
- Inorganic and Organic Chemistry Department
- University of Barcelona
- Barcelona
- Spain
| | - V. Lloveras
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)
- Bellaterra
- Spain
- CIBER-BBN
- Barcelona
| | - J. L. Muñoz-Gómez
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)
- Bellaterra
- Spain
- CIBER-BBN
- Barcelona
| | - M. Pons
- Biomolecular NMR laboratory
- Inorganic and Organic Chemistry Department
- University of Barcelona
- Barcelona
- Spain
| | - J. Veciana
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)
- Bellaterra
- Spain
- CIBER-BBN
- Barcelona
| | - J. Vidal-Gancedo
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)
- Bellaterra
- Spain
- CIBER-BBN
- Barcelona
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17
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Badetti E, Lloveras V, Romano F, Di Lorenzo R, Veciana J, Vidal‐Gancedo J, Zonta C, Licini G. Front Cover: Discrimination of Octahedral versus Trigonal Bipyramidal Coordination Geometries of Homogeneous Ti
IV
, V
V
, and Mo
VI
Amino Triphenolate Complexes through Nitroxyl Radical Units (Eur. J. Inorg. Chem. 31/2016). Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201670311] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Elena Badetti
- Dipartimento di Scienze Chimiche and CIRCCUniversità di Padovavia Marzolo 135131PadovaItaly
| | - Vega Lloveras
- Institut de Ciència de Materials de Barcelona (CSIC) and Networking Research Center on BioengineeringBiomaterials and Nanomedicine (CIBER‐BBN)Campus Universitari de Bellaterra08193CerdanyolaSpain
| | - Francesco Romano
- Dipartimento di Scienze Chimiche and CIRCCUniversità di Padovavia Marzolo 135131PadovaItaly
| | - Rosalia Di Lorenzo
- Dipartimento di Scienze Chimiche and CIRCCUniversità di Padovavia Marzolo 135131PadovaItaly
| | - Jaume Veciana
- Institut de Ciència de Materials de Barcelona (CSIC) and Networking Research Center on BioengineeringBiomaterials and Nanomedicine (CIBER‐BBN)Campus Universitari de Bellaterra08193CerdanyolaSpain
| | - José Vidal‐Gancedo
- Institut de Ciència de Materials de Barcelona (CSIC) and Networking Research Center on BioengineeringBiomaterials and Nanomedicine (CIBER‐BBN)Campus Universitari de Bellaterra08193CerdanyolaSpain
| | - Cristiano Zonta
- Dipartimento di Scienze Chimiche and CIRCCUniversità di Padovavia Marzolo 135131PadovaItaly
| | - Giulia Licini
- Dipartimento di Scienze Chimiche and CIRCCUniversità di Padovavia Marzolo 135131PadovaItaly
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18
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Badetti E, Lloveras V, Romano F, Di Lorenzo R, Veciana J, Vidal‐Gancedo J, Zonta C, Licini G. Discrimination of Octahedral versus Trigonal Bipyramidal Coordination Geometries of Homogeneous Ti
IV
, V
V
, and Mo
VI
Amino Triphenolate Complexes through Nitroxyl Radical Units. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201601231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Elena Badetti
- Dipartimento di Scienze Chimiche and CIRCCUniversità di Padovavia Marzolo 135131PadovaItaly
| | - Vega Lloveras
- Institut de Ciència de Materials de Barcelona (CSIC) and Networking Research Center on BioengineeringBiomaterials and Nanomedicine (CIBER‐BBN)Campus Universitari de Bellaterra08193CerdanyolaSpain
| | - Francesco Romano
- Dipartimento di Scienze Chimiche and CIRCCUniversità di Padovavia Marzolo 135131PadovaItaly
| | - Rosalia Di Lorenzo
- Dipartimento di Scienze Chimiche and CIRCCUniversità di Padovavia Marzolo 135131PadovaItaly
| | - Jaume Veciana
- Institut de Ciència de Materials de Barcelona (CSIC) and Networking Research Center on BioengineeringBiomaterials and Nanomedicine (CIBER‐BBN)Campus Universitari de Bellaterra08193CerdanyolaSpain
| | - José Vidal‐Gancedo
- Institut de Ciència de Materials de Barcelona (CSIC) and Networking Research Center on BioengineeringBiomaterials and Nanomedicine (CIBER‐BBN)Campus Universitari de Bellaterra08193CerdanyolaSpain
| | - Cristiano Zonta
- Dipartimento di Scienze Chimiche and CIRCCUniversità di Padovavia Marzolo 135131PadovaItaly
| | - Giulia Licini
- Dipartimento di Scienze Chimiche and CIRCCUniversità di Padovavia Marzolo 135131PadovaItaly
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19
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Badetti E, Lloveras V, Romano F, Di Lorenzo R, Veciana J, Vidal-Gancedo J, Zonta C, Licini G. Discrimination of Octahedral versus Trigonal Bipyramidal Coordination Geometries of Homogeneous TiIV, VV, and MoVIAmino Triphenolate Complexes through Nitroxyl Radical Units. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600649] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [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)
- Elena Badetti
- Dipartimento di Scienze Chimiche and CIRCC; Università di Padova; via Marzolo 1 35131 Padova Italy
| | - Vega Lloveras
- Institut de Ciència de Materials de Barcelona (CSIC) and Networking Research Center on Bioengineering; Biomaterials and Nanomedicine (CIBER-BBN); Campus Universitari de Bellaterra 08193 Cerdanyola Spain
| | - Francesco Romano
- Dipartimento di Scienze Chimiche and CIRCC; Università di Padova; via Marzolo 1 35131 Padova Italy
| | - Rosalia Di Lorenzo
- Dipartimento di Scienze Chimiche and CIRCC; Università di Padova; via Marzolo 1 35131 Padova Italy
| | - Jaume Veciana
- Institut de Ciència de Materials de Barcelona (CSIC) and Networking Research Center on Bioengineering; Biomaterials and Nanomedicine (CIBER-BBN); Campus Universitari de Bellaterra 08193 Cerdanyola Spain
| | - José Vidal-Gancedo
- Institut de Ciència de Materials de Barcelona (CSIC) and Networking Research Center on Bioengineering; Biomaterials and Nanomedicine (CIBER-BBN); Campus Universitari de Bellaterra 08193 Cerdanyola Spain
| | - Cristiano Zonta
- Dipartimento di Scienze Chimiche and CIRCC; Università di Padova; via Marzolo 1 35131 Padova Italy
| | - Giulia Licini
- Dipartimento di Scienze Chimiche and CIRCC; Università di Padova; via Marzolo 1 35131 Padova Italy
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20
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Souto M, Lloveras V, Vela S, Fumanal M, Ratera I, Veciana J. Three Redox States of a Diradical Acceptor-Donor-Acceptor Triad: Gating the Magnetic Coupling and the Electron Delocalization. J Phys Chem Lett 2016; 7:2234-2239. [PMID: 27231856 DOI: 10.1021/acs.jpclett.6b00912] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The diradical acceptor-donor-acceptor triad 1(••), based on two polychlorotriphenylmethyl (PTM) radicals connected through a tetrathiafulvalene(TTF)-vinylene bridge, has been synthesized. The generation of the mixed-valence radical anion, 1(•-), and triradical cation species, 1(•••+), obtained upon electrochemical reduction and oxidation, respectively, was monitored by optical and ESR spectroscopy. Interestingly, the modification of electron delocalization and magnetic coupling was observed when the charged species were generated and the changes have been rationalized by theoretical calculations.
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Affiliation(s)
- Manuel Souto
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)/CIBER-BBN, Campus Universitari de la UAB, 08193 Cerdanyola del Vallès (Barcelona), Spain
| | - Vega Lloveras
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)/CIBER-BBN, Campus Universitari de la UAB, 08193 Cerdanyola del Vallès (Barcelona), Spain
| | - Sergi Vela
- Laboratoire de Chimie Quantique, Université de Strasbourg , 4 rue Blaise Pascal, F-67000 Strasbourg, France
| | - Maria Fumanal
- Laboratoire de Chimie Quantique, Université de Strasbourg , 4 rue Blaise Pascal, F-67000 Strasbourg, France
| | - Imma Ratera
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)/CIBER-BBN, Campus Universitari de la UAB, 08193 Cerdanyola del Vallès (Barcelona), Spain
| | - Jaume Veciana
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)/CIBER-BBN, Campus Universitari de la UAB, 08193 Cerdanyola del Vallès (Barcelona), Spain
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21
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Lloveras V, Badetti E, Veciana J, Vidal-Gancedo J. Dynamics of intramolecular spin exchange interaction of a nitronyl nitroxide diradical in solution and on surfaces. Nanoscale 2016; 8:5049-5058. [PMID: 26864080 DOI: 10.1039/c5nr08824k] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this paper we report the study of the dynamics of a thermally modulated intramolecular spin exchange interaction of a novel diradical nitronyl nitroxide-substituted disulfide in solution and when it is grafted on a gold surface. The structure of this diradical was designed to have flexible chains leading to intramolecular collisions and hence spin exchange interaction, and with an appropriate binding group to be grafted on the gold surface to study its behavior on the surface. In solution, this diradical shows a strong spin exchange interaction between both radicals which is modulated by temperature, but also gold nanoparticles (AuNPs) functionalized with this diradical permit investigation of such a phenomenon in surface-grafted radicals. The spin-labelled AuNP synthesis was optimized to obtain high coverage of spin labels to lead to high spin exchange interaction. The obtained AuNPs were studied by Electron Paramagnetic Resonance (EPR), UV-Vis, and IR spectroscopies, HR-TEM microscopy, Cyclic Voltammetry (CV), Energy Dispersive X-ray analysis (EDX) and Thermogravimetric Analysis (TGA). This inorganic-organic hybrid material also showed dipolar interactions between its radicals which were confirmed by the appearance in the EPR spectra of an |Δms| = 2 transition at half-field. This signal gives direct evidence of the presence of a high-spin state and permitted us to study the nature of the magnetic coupling between the spins which was found to be antiferromagnetic. Self-Assembled Monolayers (SAMs) of these radicals on the Au (111) substrate were also prepared and studied by contact angle, X-Ray Photoelectron Spectroscopy (XPS), Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS), Cyclic Voltammetry and EPR. The magnetic as well as the electrochemical properties of the hybrid surfaces were studied and compared with the properties of this diradical in solution. Analogies between the properties of AuNPs with high coverage of radicals and those of SAM were observed.
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Affiliation(s)
- V Lloveras
- Institut de Ciència de Materials de Barcelona ICMAB (CSIC), Campus UAB, 08193 Bellaterra, Barcelona, Spain. and CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Barcelona, Spain
| | - E Badetti
- Institut de Ciència de Materials de Barcelona ICMAB (CSIC), Campus UAB, 08193 Bellaterra, Barcelona, Spain. and CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Barcelona, Spain
| | - J Veciana
- Institut de Ciència de Materials de Barcelona ICMAB (CSIC), Campus UAB, 08193 Bellaterra, Barcelona, Spain. and CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Barcelona, Spain
| | - J Vidal-Gancedo
- Institut de Ciència de Materials de Barcelona ICMAB (CSIC), Campus UAB, 08193 Bellaterra, Barcelona, Spain. and CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Barcelona, Spain
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22
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Lloveras V, Badetti E, Wurst K, Chechik V, Veciana J, Vidal-Gancedo J. Magnetic and Electrochemical Properties of a TEMPO-Substituted Disulfide Diradical in Solution, in the Crystal, and on a Surface. Chemistry 2016; 22:1805-15. [PMID: 26743879 DOI: 10.1002/chem.201503306] [Citation(s) in RCA: 12] [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: 08/20/2015] [Revised: 11/09/2015] [Indexed: 12/15/2022]
Abstract
A study of the magnetic and electrochemical properties of a TEMPO-substituted disulfide diradical in three different environments was carried out: in solution, in the crystal, and as a self-assembled monolayer (SAM) on an Au(111) substrate, and the relationship between them was explored. In solution, this flexible diradical shows a strong spin-exchange interaction between the two nitroxide functions that depends on the temperature and solvent. Structural, dynamic, and thermodynamic information has been extracted from the EPR spectra of this dinitroxide. The magnetic interactions in the crystal include intra- and intermolecular contributions, which have been studied separately and shown to be antiferromagnetic in both cases. Finally, we demonstrate that both the magnetic and electrochemical properties are preserved upon chemisorption of the diradical on a gold surface. The resulting SAM displayed anisotropic magnetic properties, and angle-resolved EPR spectra of the monocrystal allowed a rough determination of the orientation of the molecules in the SAM.
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Affiliation(s)
- Vega Lloveras
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB s/n, 08193, Cerdanyola del Vallès, Spain.,CIBER de Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN), Barcelona, Spain), Fax
| | - Elena Badetti
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB s/n, 08193, Cerdanyola del Vallès, Spain.,CIBER de Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN), Barcelona, Spain), Fax
| | - Klaus Wurst
- Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Center for Chemistry and Biomedicine, Innrain 80-82, 6020, Innsbruck, Austria
| | - Victor Chechik
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
| | - Jaume Veciana
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB s/n, 08193, Cerdanyola del Vallès, Spain.,CIBER de Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN), Barcelona, Spain), Fax
| | - José Vidal-Gancedo
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB s/n, 08193, Cerdanyola del Vallès, Spain. .,CIBER de Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN), Barcelona, Spain), Fax.
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23
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Muñoz-Gómez JL, Monteagudo E, Lloveras V, Parella T, Veciana J, Vidal-Gancedo J. Optimized polarization build-up times in dissolution DNP-NMR using a benzyl amino derivative of BDPA. RSC Adv 2016. [DOI: 10.1039/c6ra00635c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [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] Open
Abstract
A BAm-BDPA radical has proved to be a quick and efficient polarizing agent, showing optimum 13C NMR signal enhancements per polarization time unit.
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Affiliation(s)
- J. L. Muñoz-Gómez
- Institut de Ciència de Materials de Barcelona
- (ICMAB-CSIC) Campus Universitari de Bellaterra
- E-08193 Cerdanyola del Vallès
- Spain
- Networking Research Center on Bioengineering
| | - E. Monteagudo
- Servei de Ressonància Magnètica Nuclear
- Facultat de Ciències i Biociències
- Universitat Autònoma de Barcelona
- E-08193 Bellaterra
- Spain
| | - V. Lloveras
- Institut de Ciència de Materials de Barcelona
- (ICMAB-CSIC) Campus Universitari de Bellaterra
- E-08193 Cerdanyola del Vallès
- Spain
- Networking Research Center on Bioengineering
| | - T. Parella
- Servei de Ressonància Magnètica Nuclear
- Facultat de Ciències i Biociències
- Universitat Autònoma de Barcelona
- E-08193 Bellaterra
- Spain
| | - J. Veciana
- Institut de Ciència de Materials de Barcelona
- (ICMAB-CSIC) Campus Universitari de Bellaterra
- E-08193 Cerdanyola del Vallès
- Spain
- Networking Research Center on Bioengineering
| | - J. Vidal-Gancedo
- Institut de Ciència de Materials de Barcelona
- (ICMAB-CSIC) Campus Universitari de Bellaterra
- E-08193 Cerdanyola del Vallès
- Spain
- Networking Research Center on Bioengineering
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24
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Albalad J, Aríñez-Soriano J, Vidal-Gancedo J, Lloveras V, Juanhuix J, Imaz I, Aliaga-Alcalde N, Maspoch D. Hetero-bimetallic paddlewheel clusters in coordination polymers formed by a water-induced single-crystal-to-single-crystal transformation. Chem Commun (Camb) 2016; 52:13397-13400. [DOI: 10.1039/c6cc07653j] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Hetero-bimetallic paddlewheel clusters in coordination polymers are formed through a water-induced single-crystal to single-crystal transformation.
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Affiliation(s)
- Jorge Albalad
- Catalan Institute of Nanoscience and Nanotechnology (ICN2)
- CSIC and The Barcelona Institute of Science and Technology
- Campus UAB
- Bellaterra
- Spain
| | - Javier Aríñez-Soriano
- Catalan Institute of Nanoscience and Nanotechnology (ICN2)
- CSIC and The Barcelona Institute of Science and Technology
- Campus UAB
- Bellaterra
- Spain
| | - José Vidal-Gancedo
- Institut de Ciència de Materials de Barcelona (ICMAB-SCIC)
- Bellaterra
- Spain
- CIBER-BBN
- Barcelona
| | - Vega Lloveras
- Institut de Ciència de Materials de Barcelona (ICMAB-SCIC)
- Bellaterra
- Spain
- CIBER-BBN
- Barcelona
| | | | - Inhar Imaz
- Catalan Institute of Nanoscience and Nanotechnology (ICN2)
- CSIC and The Barcelona Institute of Science and Technology
- Campus UAB
- Bellaterra
- Spain
| | - Núria Aliaga-Alcalde
- Institut de Ciència de Materials de Barcelona (ICMAB-SCIC)
- Bellaterra
- Spain
- ICREA
- 08010 Barcelona
| | - Daniel Maspoch
- Catalan Institute of Nanoscience and Nanotechnology (ICN2)
- CSIC and The Barcelona Institute of Science and Technology
- Campus UAB
- Bellaterra
- Spain
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25
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Muñoz-Gómez JL, Monteagudo E, Lloveras V, Parella T, Veciana J, Vidal-Gancedo J. A benzyl alcohol derivative of the BDPA radical for fast dissolution dynamic nuclear polarization NMR spectroscopy. Org Biomol Chem 2015; 13:2689-93. [PMID: 25586215 DOI: 10.1039/c4ob02356k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [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 synthesis, structural characterization and the successful application of a carbon centered radical derived from 1,3-bisdiphenylene-2-phenylallyl (BDPA), its benzyl alcohol derivative (BA-BDPA), as a polarizing agent for Dynamic Nuclear Polarization (DNP) are described. The reported BA-BDPA radical meets all the requirements to become a promising candidate for its use in in vivo DNP-NMR experiments: it is soluble in neat [1-(13)C]pyruvic acid, insoluble in the dissolution transfer solvent and is effective as a polarizing agent in fast dissolution DNP-NMR applications, without the need for using glassing agents. Moreover, it enables a simple but effective in-line radical filtration to obtain hyperpolarized solutions of [1-(13)C]pyruvic acid free of radicals that offers a better polarization performance.
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Affiliation(s)
- J L Muñoz-Gómez
- Institut de Ciència de Materials de Barcelona, (ICMAB-CSIC) Campus Universitari de Bellaterra, E-08193 Cerdanyola del Vallès, Spain.
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26
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Lloveras V, Badetti E, Wurst K, Vidal-Gancedo J. Synthesis, X-Ray Structure, Magnetic Properties, and a Study of Intra/Intermolecular Radical-Radical Interactions of a Triradical TEMPO Compound. Chemphyschem 2015; 16:3302-7. [PMID: 26489060 DOI: 10.1002/cphc.201500462] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [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: 06/11/2015] [Indexed: 12/15/2022]
Abstract
A novel triradical compound with a P=S core and three branches functionalized with 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) radicals is synthesized and characterized by IR, (1) H NMR, (31) P NMR, and EPR spectroscopy and MALDI-TOF mass spectrometry, and its chemical structure is confirmed by X-ray diffraction analysis. The triradical shows neither spin exchange interactions between its radical units nor detectable dipolar interactions. This is consistent with the separation between the radical units found in its X-ray diffraction structure, and discounts the existence of intramolecular interactions. This conclusion is confirmed by an EPR concentration study. The concentration at which intermolecular interactions start to appear is determined (5×10(-3) m) and this concentration should be taken into account as a higher concentration limit when studies on intramolecular radical-radical interactions in polyradicals with similar structure are required. SQUID magnetometry analysis of the compound shows antiferromagnetic interactions between the spin carriers of different molecules; that is, antiferromagnetic intermolecular interactions.
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Affiliation(s)
- Vega Lloveras
- Institut de Ciència de Materiales de Barcelona (ICMAB-CSIC), Campus UAB s/n, E-08193, Cerdanyola del Vallès, Spain.,CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Barcelona, Spain
| | - Elena Badetti
- Institut de Ciència de Materiales de Barcelona (ICMAB-CSIC), Campus UAB s/n, E-08193, Cerdanyola del Vallès, Spain.,CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Barcelona, Spain.,Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Via Marzolo, 1, 35131, Padova, Italy
| | - Klaus Wurst
- Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Center for Chemistry and Biomedicine, Innrain 80-82, A-6020, Innsbruck, Austria
| | - José Vidal-Gancedo
- Institut de Ciència de Materiales de Barcelona (ICMAB-CSIC), Campus UAB s/n, E-08193, Cerdanyola del Vallès, Spain. .,CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Barcelona, Spain.
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27
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Badetti E, Lloveras V, Muñoz-Gómez JL, Sebastián RM, Caminade AM, Majoral JP, Veciana J, Vidal-Gancedo J. Radical Dendrimers: A Family of Five Generations of Phosphorus Dendrimers Functionalized with TEMPO Radicals. Macromolecules 2014. [DOI: 10.1021/ma502062q] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Elena Badetti
- Institut
de Ciència de Materials de Barcelona, ICMAB−CSIC, Campus universitari de Bellaterra, 08193 Bellaterra, Barcelona, Spain
- CIBER de Bioingeniería,
Biomateriales y Nanomedicina, CIBER-BBN, Barcelona, Spain
| | - Vega Lloveras
- Institut
de Ciència de Materials de Barcelona, ICMAB−CSIC, Campus universitari de Bellaterra, 08193 Bellaterra, Barcelona, Spain
- CIBER de Bioingeniería,
Biomateriales y Nanomedicina, CIBER-BBN, Barcelona, Spain
| | - Jose Luis Muñoz-Gómez
- Institut
de Ciència de Materials de Barcelona, ICMAB−CSIC, Campus universitari de Bellaterra, 08193 Bellaterra, Barcelona, Spain
- CIBER de Bioingeniería,
Biomateriales y Nanomedicina, CIBER-BBN, Barcelona, Spain
| | | | - Anne Marie Caminade
- Laboratoire
de Chimie de Coordination, CNRS, 205 Route de Narbonne, BP 44099, 31077 Toulouse Cedex 4, France
| | - Jean Pierre Majoral
- Laboratoire
de Chimie de Coordination, CNRS, 205 Route de Narbonne, BP 44099, 31077 Toulouse Cedex 4, France
| | - Jaume Veciana
- Institut
de Ciència de Materials de Barcelona, ICMAB−CSIC, Campus universitari de Bellaterra, 08193 Bellaterra, Barcelona, Spain
- CIBER de Bioingeniería,
Biomateriales y Nanomedicina, CIBER-BBN, Barcelona, Spain
| | - José Vidal-Gancedo
- Institut
de Ciència de Materials de Barcelona, ICMAB−CSIC, Campus universitari de Bellaterra, 08193 Bellaterra, Barcelona, Spain
- CIBER de Bioingeniería,
Biomateriales y Nanomedicina, CIBER-BBN, Barcelona, Spain
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28
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Muñoz-Gómez JL, Marín-Montesinos I, Lloveras V, Pons M, Vidal-Gancedo J, Veciana J. Novel PTM–TEMPO Biradical for Fast Dissolution Dynamic Nuclear Polarization. Org Lett 2014; 16:5402-5. [DOI: 10.1021/ol502644x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jose-Luis Muñoz-Gómez
- Institut de Ciència
de Materials de Barcelona ICMAB−CSIC, Campus UAB, 08193 Bellaterra, Barcelona, Spain
- CIBER de Bioingeniería,
Biomateriales y Nanomedicina, CIBER-BBN, Barcelona, Spain
| | - Ildefonso Marín-Montesinos
- Biomolecular NMR
Laboratory, Organic Chemistry Department, UB, Martí i Franquès 1-11, 08028, Barcelona, Spain
| | - Vega Lloveras
- Institut de Ciència
de Materials de Barcelona ICMAB−CSIC, Campus UAB, 08193 Bellaterra, Barcelona, Spain
- CIBER de Bioingeniería,
Biomateriales y Nanomedicina, CIBER-BBN, Barcelona, Spain
| | - Miquel Pons
- Biomolecular NMR
Laboratory, Organic Chemistry Department, UB, Martí i Franquès 1-11, 08028, Barcelona, Spain
| | - José Vidal-Gancedo
- Institut de Ciència
de Materials de Barcelona ICMAB−CSIC, Campus UAB, 08193 Bellaterra, Barcelona, Spain
- CIBER de Bioingeniería,
Biomateriales y Nanomedicina, CIBER-BBN, Barcelona, Spain
| | - Jaume Veciana
- Institut de Ciència
de Materials de Barcelona ICMAB−CSIC, Campus UAB, 08193 Bellaterra, Barcelona, Spain
- CIBER de Bioingeniería,
Biomateriales y Nanomedicina, CIBER-BBN, Barcelona, Spain
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29
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González SR, Nieto-Ortega B, González Cano RC, Lloveras V, Novoa JJ, Mota F, Vidal-Gancedo J, Rovira C, Veciana J, del Corro E, Taravillo M, Baonza VG, López Navarrete JT, Casado J. Diradicals acting through diamagnetic phenylene vinylene bridges: Raman spectroscopy as a probe to characterize spin delocalization. J Chem Phys 2014; 140:164903. [PMID: 24784306 DOI: 10.1063/1.4871895] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
We present a complete Raman spectroscopic study in two structurally well-defined diradical species of different lengths incorporating oligo p-phenylene vinylene bridges between two polychlorinated triphenylmethyl radical units, a disposition that allows sizeable conjugation between the two radicals through and with the bridge. The spectroscopic data are interpreted and supported by quantum chemical calculations. We focus the attention on the Raman frequency changes, interpretable in terms of: (i) bridge length (conjugation length); (ii) bridge conformational structure; and (iii) electronic coupling between the terminal radical units with the bridge and through the bridge, which could delineate through-bond spin polarization, or spin delocalization. These items are addressed by using the "oligomer approach" in conjunction with pressure and temperature dependent Raman spectroscopic data. In summary, we have attempted to translate the well-known strategy to study the electron (charge) structure of π-conjugated molecules by Raman spectroscopy to the case of electron (spin) interactions via the spin delocalization mechanism.
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Affiliation(s)
| | - Belén Nieto-Ortega
- Department of Physical Chemistry, University of Málaga, Campus de Teatinos s/n, Málaga 29071, Spain
| | - Rafael C González Cano
- Department of Physical Chemistry, University of Málaga, Campus de Teatinos s/n, Málaga 29071, Spain
| | - Vega Lloveras
- Department of Molecular Nanoscience and Organic Materials, Institut de Ciència de Materials de Barcelona (CSIC), Campus Universitari de Bellaterra, E-08193 Cerdanyola, Barcelona, Spain
| | - Juan J Novoa
- Dpt. de Química Física and IQTCUB, Fac. Química, Univ. de Barcelona, Av. Diagonal, 647, 08028-Barcelona, Spain
| | - Fernando Mota
- Dpt. de Química Física and IQTCUB, Fac. Química, Univ. de Barcelona, Av. Diagonal, 647, 08028-Barcelona, Spain
| | - José Vidal-Gancedo
- Department of Molecular Nanoscience and Organic Materials, Institut de Ciència de Materials de Barcelona (CSIC), Campus Universitari de Bellaterra, E-08193 Cerdanyola, Barcelona, Spain
| | - Concepció Rovira
- Department of Molecular Nanoscience and Organic Materials, Institut de Ciència de Materials de Barcelona (CSIC), Campus Universitari de Bellaterra, E-08193 Cerdanyola, Barcelona, Spain
| | - Jaume Veciana
- Department of Molecular Nanoscience and Organic Materials, Institut de Ciència de Materials de Barcelona (CSIC), Campus Universitari de Bellaterra, E-08193 Cerdanyola, Barcelona, Spain
| | - Elena del Corro
- MALTA-Consolider Team, Department of Physical Chemistry, University Complutense of Madrid, Madrid 28040, Spain
| | - Mercedes Taravillo
- MALTA-Consolider Team, Department of Physical Chemistry, University Complutense of Madrid, Madrid 28040, Spain
| | - Valentín G Baonza
- MALTA-Consolider Team, Department of Physical Chemistry, University Complutense of Madrid, Madrid 28040, Spain
| | - Juan T López Navarrete
- Department of Physical Chemistry, University of Málaga, Campus de Teatinos s/n, Málaga 29071, Spain
| | - Juan Casado
- Department of Physical Chemistry, University of Málaga, Campus de Teatinos s/n, Málaga 29071, Spain
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30
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Calbo J, Aragó J, Otón F, Lloveras V, Mas‐Torrent M, Vidal‐Gancedo J, Veciana J, Rovira C, Ortí E. Tetrathiafulvalene‐Based Mixed‐Valence Acceptor–Donor–Acceptor Triads: A Joint Theoretical and Experimental Approach. Chemistry 2013; 19:16656-64. [DOI: 10.1002/chem.201302910] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Revised: 09/12/2013] [Indexed: 11/07/2022]
Affiliation(s)
- Joaquín Calbo
- Instituto de Ciencia Molecular, Universidad de Valencia, 46980 Paterna (Spain)
| | - Juan Aragó
- Instituto de Ciencia Molecular, Universidad de Valencia, 46980 Paterna (Spain)
| | - Francisco Otón
- Institut de Ciència de Materials de Barcelona (ICMAB‐CSIC) and Networking Research Center on Bioengineering Biomaterials and Nanomedicine (CIBER‐BBN), Campus Universitari de Bellaterra Cerdanyola, 08193 Barcelona (Spain)
| | - Vega Lloveras
- Institut de Ciència de Materials de Barcelona (ICMAB‐CSIC) and Networking Research Center on Bioengineering Biomaterials and Nanomedicine (CIBER‐BBN), Campus Universitari de Bellaterra Cerdanyola, 08193 Barcelona (Spain)
| | - Marta Mas‐Torrent
- Institut de Ciència de Materials de Barcelona (ICMAB‐CSIC) and Networking Research Center on Bioengineering Biomaterials and Nanomedicine (CIBER‐BBN), Campus Universitari de Bellaterra Cerdanyola, 08193 Barcelona (Spain)
| | - José Vidal‐Gancedo
- Institut de Ciència de Materials de Barcelona (ICMAB‐CSIC) and Networking Research Center on Bioengineering Biomaterials and Nanomedicine (CIBER‐BBN), Campus Universitari de Bellaterra Cerdanyola, 08193 Barcelona (Spain)
| | - Jaume Veciana
- Institut de Ciència de Materials de Barcelona (ICMAB‐CSIC) and Networking Research Center on Bioengineering Biomaterials and Nanomedicine (CIBER‐BBN), Campus Universitari de Bellaterra Cerdanyola, 08193 Barcelona (Spain)
| | - Concepció Rovira
- Institut de Ciència de Materials de Barcelona (ICMAB‐CSIC) and Networking Research Center on Bioengineering Biomaterials and Nanomedicine (CIBER‐BBN), Campus Universitari de Bellaterra Cerdanyola, 08193 Barcelona (Spain)
| | - Enrique Ortí
- Instituto de Ciencia Molecular, Universidad de Valencia, 46980 Paterna (Spain)
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31
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Soto M, Comalrena H, Balduzzi U, Guirado G, Lloveras V, Vidal-Gancedo J, Sebastián RM, Marquet J. Activation of weak nucleophiles: polyfluorocarbamates from polyfluoroalcohols via a fast radical reaction. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.09.037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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32
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Badetti E, Lloveras V, Wurst K, Sebastián RM, Caminade AM, Majoral JP, Veciana J, Vidal-Gancedo J. Synthesis and structural characterization of a dendrimer model compound based on a cyclotriphosphazene core with TEMPO radicals as substituents. Org Lett 2013; 15:3490-3. [PMID: 23829655 DOI: 10.1021/ol401017c] [Citation(s) in RCA: 29] [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: 01/16/2023]
Abstract
The synthesis of the 3Gc0T zero generation dendrimer with a cyclotriphosphazene core functionalized with nitroxyl radicals in its six branches has been performed. The radical units have been used as probes to determine the orientation of the six branches in solution experimentally by Electron Paramagnetic Resonance (EPR) spectroscopy compared with the structure obtained in the solid state by X-ray diffraction. The orientation of the dendrimer branches is the same in solution as in the solid state.
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Affiliation(s)
- Elena Badetti
- Institut de Ciència de Materials de Barcelona ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Barcelona, Spain
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33
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Guasch J, Grisanti L, Souto M, Lloveras V, Vidal-Gancedo J, Ratera I, Painelli A, Rovira C, Veciana J. Intra- and Intermolecular Charge Transfer in Aggregates of Tetrathiafulvalene-Triphenylmethyl Radical Derivatives in Solution. J Am Chem Soc 2013; 135:6958-67. [DOI: 10.1021/ja400281b] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Judith Guasch
- Institut de Ciència de
Materials de Barcelona (ICMAB-CSIC)/CIBER-BBN, Campus Universitari de Bellaterra, E-08193 Cerdanyola del Vallès
(Barcelona), Spain
| | - Luca Grisanti
- Dipartimento
Chimica, GIAF, Parma University/INSTM-UdR, I-4310 Parma, Italy
| | - Manuel Souto
- Institut de Ciència de
Materials de Barcelona (ICMAB-CSIC)/CIBER-BBN, Campus Universitari de Bellaterra, E-08193 Cerdanyola del Vallès
(Barcelona), Spain
| | - Vega Lloveras
- Institut de Ciència de
Materials de Barcelona (ICMAB-CSIC)/CIBER-BBN, Campus Universitari de Bellaterra, E-08193 Cerdanyola del Vallès
(Barcelona), Spain
| | - José Vidal-Gancedo
- Institut de Ciència de
Materials de Barcelona (ICMAB-CSIC)/CIBER-BBN, Campus Universitari de Bellaterra, E-08193 Cerdanyola del Vallès
(Barcelona), Spain
| | - Imma Ratera
- Institut de Ciència de
Materials de Barcelona (ICMAB-CSIC)/CIBER-BBN, Campus Universitari de Bellaterra, E-08193 Cerdanyola del Vallès
(Barcelona), Spain
| | - Anna Painelli
- Dipartimento
Chimica, GIAF, Parma University/INSTM-UdR, I-4310 Parma, Italy
| | - Concepció Rovira
- Institut de Ciència de
Materials de Barcelona (ICMAB-CSIC)/CIBER-BBN, Campus Universitari de Bellaterra, E-08193 Cerdanyola del Vallès
(Barcelona), Spain
| | - Jaume Veciana
- Institut de Ciència de
Materials de Barcelona (ICMAB-CSIC)/CIBER-BBN, Campus Universitari de Bellaterra, E-08193 Cerdanyola del Vallès
(Barcelona), Spain
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34
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Kareev IE, Laukhina E, Bubnov VP, Martynenko VM, Lloveras V, Vidal-Gancedo J, Mas-Torrent M, Veciana J, Rovira C. Harnessing Electron Transfer from the Perchlorotriphenylmethide Anion to Y@C82(C2v) to Engineer an Endometallofullerene-Based Salt. Chemphyschem 2013; 14:1670-5. [DOI: 10.1002/cphc.201300107] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Indexed: 11/06/2022]
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35
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Aragay G, Frontera A, Lloveras V, Vidal-Gancedo J, Ballester P. Different Nature of the Interactions between Anions and HAT(CN)6: From Reversible Anion−π Complexes to Irreversible Electron-Transfer Processes (HAT(CN)6 = 1,4,5,8,9,12-Hexaazatriphenylene). J Am Chem Soc 2013; 135:2620-7. [DOI: 10.1021/ja309960m] [Citation(s) in RCA: 95] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Gemma Aragay
- Institute of Chemical Research of Catalonia (ICIQ), Avgda. Països Catalans
16, 43007 Tarragona, Spain
| | - Antonio Frontera
- Departament de Química, Universitat de les Illes Balears (UIB), 07122 Palma
de Mallorca, Spain
| | - Vega Lloveras
- ICMAB-CSIC, Campus de Bellaterra, 08193 Bellaterra,
Barcelona, and CIBER-BBN, Barcelona, Spain
| | - José Vidal-Gancedo
- ICMAB-CSIC, Campus de Bellaterra, 08193 Bellaterra,
Barcelona, and CIBER-BBN, Barcelona, Spain
| | - Pablo Ballester
- Institute of Chemical Research of Catalonia (ICIQ), Avgda. Països Catalans
16, 43007 Tarragona, Spain
- Catalan Institution for Research and Advanced Studies (ICREA), Passeig Lluís
Companys, 23, 08018 Barcelona, Spain
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Guasch J, Grisanti L, Lloveras V, Vidal-Gancedo J, Souto M, Morales DC, Vilaseca M, Sissa C, Painelli A, Ratera I, Rovira C, Veciana J. Induced Self-Assembly of a Tetrathiafulvalene-Based Open-Shell Dyad through Intramolecular Electron Transfer. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201203448] [Citation(s) in RCA: 12] [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: 11/07/2022]
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Guasch J, Grisanti L, Lloveras V, Vidal-Gancedo J, Souto M, Morales DC, Vilaseca M, Sissa C, Painelli A, Ratera I, Rovira C, Veciana J. Induced Self-Assembly of a Tetrathiafulvalene-Based Open-Shell Dyad through Intramolecular Electron Transfer. Angew Chem Int Ed Engl 2012; 51:11024-8. [DOI: 10.1002/anie.201203448] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2012] [Revised: 09/10/2012] [Indexed: 11/11/2022]
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Otón F, Lloveras V, Mas-Torrent M, Vidal-Gancedo J, Veciana J, Rovira C. Coupling Tetracyanoquinodimethane to Tetrathiafulvalene: A Fused TCNQ-TTF-TCNQ Triad. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201104841] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Otón F, Lloveras V, Mas-Torrent M, Vidal-Gancedo J, Veciana J, Rovira C. Coupling Tetracyanoquinodimethane to Tetrathiafulvalene: A Fused TCNQ-TTF-TCNQ Triad. Angew Chem Int Ed Engl 2011; 50:10902-6. [DOI: 10.1002/anie.201104841] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2011] [Indexed: 11/06/2022]
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Lloveras V, Vidal-Gancedo J, Figueira-Duarte TM, Nierengarten JF, Novoa JJ, Mota F, Ventosa N, Rovira C, Veciana J. Tunneling versus Hopping in Mixed-Valence Oligo-p-phenylenevinylene Polychlorinated Bis(triphenylmethyl) Radical Anions. J Am Chem Soc 2011; 133:5818-33. [DOI: 10.1021/ja1083859] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Simão C, Mas-Torrent M, Crivillers N, Lloveras V, Artés JM, Gorostiza P, Veciana J, Rovira C. A robust molecular platform for non-volatile memory devices with optical and magnetic responses. Nat Chem 2011; 3:359-64. [DOI: 10.1038/nchem.1013] [Citation(s) in RCA: 177] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2010] [Accepted: 02/17/2011] [Indexed: 12/27/2022]
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González I, Pla-Quintana A, Roglans A, Dachs A, Solà M, Parella T, Farjas J, Roura P, Lloveras V, Vidal-Gancedo J. Ene reactions between two alkynes? Doors open to thermally induced cycloisomerization of macrocyclic triynes and enediynes. Chem Commun (Camb) 2010; 46:2944-6. [PMID: 20386831 DOI: 10.1039/b926497c] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Iván González
- Dept. de Química, Universitat de Girona (UdG), Campus de Montilivi, s/n, E-17071-Girona, Spain
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Figueira-Duarte TM, Lloveras V, Vidal-Gancedo J, Delavaux-Nicot B, Duhayon C, Veciana J, Rovira C, Nierengarten JF. Ground State Electronic Interactions in Macrocyclic Fullerene Bis-Adducts Functionalized with Bridging Conjugated Oligomers. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900830] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Rodríguez-Rodríguez C, Sánchez de Groot N, Rimola A, Alvarez-Larena A, Lloveras V, Vidal-Gancedo J, Ventura S, Vendrell J, Sodupe M, González-Duarte P. Design, selection, and characterization of thioflavin-based intercalation compounds with metal chelating properties for application in Alzheimer's disease. J Am Chem Soc 2009; 131:1436-51. [PMID: 19133767 DOI: 10.1021/ja806062g] [Citation(s) in RCA: 170] [Impact Index Per Article: 11.3] [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
Metal chelation is considered a rational therapeutic approach for interdicting Alzheimer's amyloid pathogenesis. At present, enhancing the targeting and efficacy of metal-ion chelating agents through ligand design is a main strategy in the development of the next generation of metal chelators. Inspired by the traditional dye Thioflavin-T, we have designed new multifunctional molecules that contain both amyloid binding and metal chelating properties. In silico techniques have enabled us to identify commercial compounds that enclose the designed molecular framework (M1), include potential antioxidant properties, facilitate the formation of iodine-labeled derivatives, and can be permeable through the blood-brain barrier. Iodination reactions of the selected compounds, 2-(2-hydroxyphenyl)benzoxazole (HBX), 2-(2-hydroxyphenyl)benzothiazole (HBT), and 2-(2-aminophenyl)-1H-benzimidazole (BM), have led to the corresponding iodinated derivatives HBXI, HBTI, and BMI, which have been characterized by X-ray diffraction. The chelating properties of the latter compounds toward Cu(II) and Zn(II) have been examined in the solid phase and in solution. The acidity constants of HBXI, HBTI, and BMI and the formation constants of the corresponding ML and ML2 complexes [M = Cu(II), Zn(II)] have been determined by UV-vis pH titrations. The calculated values for the overall formation constants for the ML2 complexes indicate the suitability of the HBXI, HBTI, and BMI ligands for sequestering Cu(II) and Zn(II) metal ions present in freshly prepared solutions of beta-amyloid (Abeta) peptide. This was confirmed by Abeta aggregation studies showing that these compounds are able to arrest the metal-promoted increase in amyloid fibril buildup. The fluorescence features of HBX, HBT, BM, and the corresponding iodinated derivatives, together with fluorescence microscopy studies on two types of pregrown fibrils, have shown that HBX and HBT compounds could behave as potential markers for the presence of amyloid fibrils, whereas HBXI and HBTI may be especially suitable for radioisotopic detection of Abeta deposits. Taken together, the results reported in this work show the potential of new multifunctional thioflavin-based chelating agents as Alzheimer's disease therapeutics.
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Figueira-Duarte TM, Lloveras V, Vidal-Gancedo J, Gégout A, Delavaux-Nicot B, Welter R, Veciana J, Rovira C, Nierengarten JF. Changes in electronic couplings of mixed-valence systems due to through-space intramolecular interactions. Chem Commun (Camb) 2007:4345-7. [PMID: 17957281 DOI: 10.1039/b707522g] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [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 strength of the electronic interactions between the two redox moieties in fullerene-substituted mixed-valence bis(ferrocenylethynyl)ethene derivatives is modulated by the through-space intramolecular electronic interactions of C(60) with the bridging conjugated system.
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Affiliation(s)
- Teresa M Figueira-Duarte
- Groupe de Chimie des Fullerènes et des Systèmes Conjugués, Laboratoire de Chimie de Coordination du CNRS (UPR 8241), 205 route de Narbonne, 31077, Toulouse Cedex 4, France
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Caballero A, Lloveras V, Curiel D, Tárraga A, Espinosa A, García R, Vidal-Gancedo J, Rovira C, Wurst K, Molina P, Veciana J. Electroactive thiazole derivatives capped with ferrocenyl units showing charge-transfer transition and selective ion-sensing properties: a combined experimental and theoretical study. Inorg Chem 2007; 46:825-38. [PMID: 17257026 DOI: 10.1021/ic061803b] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.4] [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
The synthesis, optical and electrochemical properties, and X-ray characterization of two thiazole derivatives capped by ferrocenyl groups (5 and 7) and their model compounds with one ferrocenyl, either at 2 or 5 position of the mono- or bis-thiazolyl rings (3, 9, 11, and 14), are presented. Bisferrocenyl thiazole 5 forms the mixed-valence species 5*+ by partial oxidation which, interestingly, shows an intramolecular electron-transfer phenomenon. Moreover, the reported heteroaromatic compounds show selective ion-sensing properties. Thus, ferrocenylthiazoles linked across the 5 position of the heteroaromatic ring are selective chemosensors for Hg2+ and Pb2+ metal ions; 5-ferrocenylthiazole 3 operates through two channels, optical and redox, for Hg2+ and only optical for Pb2+, whereas 1,1'-bis(thiazolyl)ferrocene 14 is only an optical sensor for both metal ions. Moreover, complex 3 behaves as an electrochemically induced switchable chemosensor because of the low metal-ion affinity of the oxidized 3*+ species. On the other hand, ferrocenylthiazole 9, in which the heterocyclic ring and the ferrocene group are linked across the 2 position, is a selective redox sensor for Hg2+ metal ions, and it responds optically, as does bis(thiazolyl)ferrocene 11, to a narrow range of cations (Zn2+, Cd2+, Hg2+, Ni2+, and Pb2+). Finally, bis(ferrocenyl)thiazole 5 is a dual optical and redox sensor for Zn2+, Cd2+, Hg2+, Ni2+, and Pb2+, whereas bis(ferrocenyl) compound 7, bearing a bis(thiazole) unit as a bridge, is only a chromogenic sensor for Zn2+, Cd2+, Hg2+, Ni2+, and Pb2+. The experimental data and conclusions about both the electronic and ion-sensing properties are supported by DFT calculations which show, in addition, an unprecedented intramolecular electron-transfer reorganization after the first one-electron oxidation of compound 5.
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Affiliation(s)
- Antonio Caballero
- Departamento de Química OrgAnica, Facultad de Química, Campus de Espinardo, Universidad de Murcia, E-30100 Murcia, Spain
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Lloveras V, Vidal-Gancedo J, Ruiz-Molina D, Figueira-Duarte TM, Nierengarten JF, Veciana J, Rovira C. Influence of bridge topology and torsion on the intramolecular electron transfer. Faraday Discuss 2006; 131:291-305; discussion 307-24. [PMID: 16512379 DOI: 10.1039/b506678f] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [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
To study molecules able to act as good "molecular wires", intramolecular electron transfer between two triphenylmethyl redox centers connected by bridges with different topologies and substituents have been studied in solution, both by UV-Vis-NIR and EPR spectroscopies. The synthetic methodology used allows a complete control of the geometry of polychlorotriphenylmethyl diradicals 1 and 2, which have para and meta topologies, respectively, as well as of their E/Z isomerism. This fact is used to show the influence of the different topologies in the ease of electron transfer, which is larger for the para than for the meta isomer where a small or negligible electronic coupling is observed. The related diradical 3 that have the same topology as the para isomer 1 but bearing two substituents on the central phenyl ring shows similar ease of electron transfer, that the para isomer 1.
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Affiliation(s)
- Vega Lloveras
- Institut de Ciència de Materials de Barcelona (CSIC), Campus Universitari de Bellaterra, 08193 Cerdanyola, Spain
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Caballero A, Martínez R, Lloveras V, Ratera I, Vidal-Gancedo J, Wurst K, Tárraga A, Molina P, Veciana J. Highly Selective Chromogenic and Redox or Fluorescent Sensors of Hg2+in Aqueous Environment Based on 1,4-Disubstituted Azines. J Am Chem Soc 2005; 127:15666-7. [PMID: 16277484 DOI: 10.1021/ja0545766] [Citation(s) in RCA: 434] [Impact Index Per Article: 22.8] [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
Two new chemosensors that exhibit high affinity and high selectivity for Hg2+ in aqueous environment which operate through two different channels, optic/redox and optic/fluorescent, are reported. The optical change in sensing can be used even for a "naked-eye" detection of Hg2+ ions, whereas the fluorescent response can be modulated by varying the solvent polarity.
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Affiliation(s)
- Antonio Caballero
- Departamento de Química Orgánica, Facultad de Química, Universidad de Murcia, Campus de Espinardo, 30100 Murcia, Spain
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Lloveras V, Caballero A, Tárraga A, Velasco MD, Espinosa A, Wurst K, Evans DJ, Vidal-Gancedo J, Rovira C, Molina P, Veciana J. Synthesis and Characterization of Radical Cations Derived from Mono- and Biferrocenyl-Substituted 2-Aza-1,3-butadienes: A Study of the Influence of an Asymmetric and Oxidizable Bridge on Intramolecular Electron Transfer. Eur J Inorg Chem 2005. [DOI: 10.1002/ejic.200400992] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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50
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Caballero A, Lloveras V, Tárraga A, Espinosa A, Velasco MD, Vidal-Gancedo J, Rovira C, Wurst K, Molina P, Veciana J. An Electroactive Nitrogen-Rich [4.4]Ferrocenophane Displaying Redox-Switchable Behavior: Selective Sensing, Complexation, and Decomplexation of Mg2+ions. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200462521] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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