1
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Bednarska-Szczepaniak K, Hałagan K, Szwed M, Przelazły E, Leśnikowski ZJ. Quantum Chemical and Biological Insights into Redox Activity of Metallacarborane Complexes in Cancer Cells. J Chem Inf Model 2024; 64:6521-6541. [PMID: 39140958 DOI: 10.1021/acs.jcim.4c00394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/15/2024]
Abstract
A relationship between the electronic properties of metal ions in metallacarboranes and their ability to modulate mitochondrial oxidase activity and membrane hyperpolarization in cancer cells was demonstrated. Quantum chemistry methods, including DFT and molecular dynamics simulations, were used to understand the oxidized and reduced forms of metallacarboranes and their intramolecular rotatory behavior. According to the low-spin assumption for metal ions, the intramolecular oscillations of cluster ligands in metallacarboranes are significantly influenced by the type of metal and correspond to the cellular uptake of these complexes in vitro. In particular, the low-spin iron compound may be a new xenogeneic booster of redox homeostasis in cancer cells resistant to cisplatin, which induces metabolic 'exhaustion' of cancer cells and their death.
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Affiliation(s)
- Katarzyna Bednarska-Szczepaniak
- Laboratory of Medicinal Chemistry, Polish Academy of Sciences, Institute of Medical Biology, 106 Lodowa, 92-232 Lodz, Poland
| | - Krzysztof Hałagan
- Department of Molecular Physics, Faculty of Chemistry, Lodz University of Technology, Żeromskiego 116, 90-924 Lodz, Poland
| | - Marzena Szwed
- Department of Medical Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, Institute of Biophysics, Pomorska 141/143, 90-236 Lodz, Poland
| | - Ewelina Przelazły
- Laboratory of Medicinal Chemistry, Polish Academy of Sciences, Institute of Medical Biology, 106 Lodowa, 92-232 Lodz, Poland
| | - Zbigniew J Leśnikowski
- Laboratory of Medicinal Chemistry, Polish Academy of Sciences, Institute of Medical Biology, 106 Lodowa, 92-232 Lodz, Poland
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2
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Marco J, Dávalos-Prado JZ, Hnyk D, Holub J, Oña OB, Alcoba DR, Ferrer M, Elguero J, Lain L, Torre A, Oliva-Enrich JM. Two Shared Icosahedral Metallacarboranes through Iron: A Joint Experimental and Theoretical Refinement of Mössbauer Spectrum in [Fe(1,2-C 2B 9H 11) 2]Cs. ACS OMEGA 2023; 8:13993-14004. [PMID: 37091389 PMCID: PMC10116535 DOI: 10.1021/acsomega.3c00422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 03/29/2023] [Indexed: 05/03/2023]
Abstract
Mössbauer and X-ray photoelectron spectroscopies (XPS) are complemented with high-level quantum-chemical computations in the study of the geometric and electronic structure of the paramagnetic salt of the metallacarborane sandwich complex [Fe(1,2-C2B9H11)2]Cs = FeSanCs. Experimental 57Fe isomer shifts and quadrupole splitting parameters are compared with the theoretical prediction, with good agreement. The appearance of two sets of Cs(3d) doublets in the XPS spectrum, separated by 2 eV, indicates that Cs has two different chemical environments due to ease of the Cs(+) cation moving around the sandwich complex with low-energy barriers, as confirmed by quantum-chemical computations. Several minimum-energy geometries of the FeSanCs structure with the corresponding energies and Mössbauer parameters are discussed, in particular the atomic charges and spin population and the surroundings of the Fe atom in the complex. The Mössbauer spectra were taken at different temperatures showing the presence of a low-spin Fe atom with S = 1/2 and thus confirming a paramagnetic FeIII species.
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Affiliation(s)
- José
F. Marco
- Instituto
de Química-Física “Rocasolano”, CSIC, E-28006 Madrid, Spain
| | | | - Drahomír Hnyk
- Institute
of Inorganic Chemistry of the Czech Academy of Sciences, CZ-250 68 Řež
near Prague, Czech Republic
| | - Josef Holub
- Institute
of Inorganic Chemistry of the Czech Academy of Sciences, CZ-250 68 Řež
near Prague, Czech Republic
| | - Ofelia B. Oña
- Instituto
de Investigaciones Fisicoquímicas Teóricas y Aplicadas,
Universidad Nacional de La Plata, CCT La Plata, Consejo Nacional de Investigaciones Científicas y Técnicas, Diag. 113 y 64 (S/N), Sucursal 4,
CC 16, 1900 La Plata, Argentina
| | - Diego R. Alcoba
- Departamento
de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina
- Instituto
de Física de Buenos Aires, Consejo
Nacional de Investigaciones Científicas y Técnicas,
Ciudad Universitaria, 1428 Buenos Aires, Argentina
| | - Maxime Ferrer
- Instituto
de Química Médica, CSIC, E-28006 Madrid, Spain
- Theoretical
Chemistry and Computational Modelling, Doctoral School, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - José Elguero
- Instituto
de Química Médica, CSIC, E-28006 Madrid, Spain
| | - Luis Lain
- Departamento
de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apartado Postal 644, E-48080 Bilbao, Spain
| | - Alicia Torre
- Departamento
de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apartado Postal 644, E-48080 Bilbao, Spain
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3
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Bednarska-Szczepaniak K, Dziedzic-Kocurek K, Przelazły E, Stanek J, Leśnikowski ZJ. Intramolecular rotations and electronic states of iron in the iron bis(dicarbollide) complex Fe[(C 2B 9H 11) 2] studied by a 57Fe nuclear probe and computational methods. Chem Commun (Camb) 2021; 58:391-394. [PMID: 34889338 DOI: 10.1039/d1cc05111c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Mössbauer spectroscopy of iron(III) bis(dicarbollide) (1) and its adduct (2) revealed low spin FeIII in 1 and surprisingly FeII in 2. In 1, the (C2B9H11) groups rotate at room temperature with a frequency of 107 Hz, getting across the energy barrier of 24 meV. Numerical simulations showed a gradient of electric charge in 2, which may explain the FeII-like character in 2.
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Affiliation(s)
| | - Katarzyna Dziedzic-Kocurek
- Marian Smoluchowski Institute of Physics, Jagiellonian University, Prof. Stanisława Łojasiewicza 11, Kraków 30-345, Poland
| | - Ewelina Przelazły
- Laboratory of Medicinal Chemistry, Institute of Medical Biology PAS, Lodowa 106, Łódź 92-232, Poland.
| | - Jan Stanek
- Marian Smoluchowski Institute of Physics, Jagiellonian University, Prof. Stanisława Łojasiewicza 11, Kraków 30-345, Poland
| | - Zbigniew J Leśnikowski
- Laboratory of Medicinal Chemistry, Institute of Medical Biology PAS, Lodowa 106, Łódź 92-232, Poland.
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4
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Zaulet A, Nuez M, Sillanpää R, Teixidor F, Viñas C. Towards purely inorganic clusters in medicine: Biocompatible divalent cations as counterions of cobaltabis(dicarbollide) and its iodinated derivatives. J Organomet Chem 2021. [DOI: 10.1016/j.jorganchem.2021.121997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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5
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Anufriev SA, Suponitsky KY, Filippov OA, Sivaev IB. Synthesis and Structure of Methylsulfanyl Derivatives of Nickel Bis(Dicarbollide). Molecules 2019; 24:molecules24244449. [PMID: 31817299 PMCID: PMC6943677 DOI: 10.3390/molecules24244449] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2019] [Revised: 11/29/2019] [Accepted: 12/02/2019] [Indexed: 11/16/2022] Open
Abstract
Symmetrically and unsymmetrically substituted methylsulfanyl derivatives of nickel(III) bis(dicarbollide) (Bu4N)[8,8'-(MeS)2-3,3'-Ni(1,2-C2B9H10)2], (Bu4N)[4,4'-(MeS)2-3,3'-Ni(1,2-C2B9H10)2], and (Bu4N)[4,7'-(MeS)2-3,3'-Ni(1,2-C2B9H10)2] were synthesized, starting from [Ni(acac)2]3 and the corresponding methylsulfanyl derivatives of nido-carborane (Bu4N)[10-MeS-7,8-C2B9H11] and (Bu4N)[10-MeS-7,8-C2B9H11]. Structures of the synthesized metallacarboranes were studied by single-crystal X-ray diffraction and quantum chemical calculations. The symmetrically substituted 8,8'-isomer adopts transoid conformation stabilized by two pairs of intramolecular C-H···S hydrogen bonds between the dicarbollide ligands. The unsymmetrically substituted 4,7'-isomer adopts gauche conformation, which is stabilized by two nonequivalent C-H···S hydrogen bonds and one short chalcogen B-H···S bond (2.53 Å, -1.4 kcal/mol). The gauche conformation was found to be also preferred for the 4,7'-isomer.
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Affiliation(s)
- Sergey A. Anufriev
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Str., Moscow 119991, Russia; (S.A.A.); (K.Y.S.); (O.A.F.)
| | - Kyrill Yu. Suponitsky
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Str., Moscow 119991, Russia; (S.A.A.); (K.Y.S.); (O.A.F.)
| | - Oleg A. Filippov
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Str., Moscow 119991, Russia; (S.A.A.); (K.Y.S.); (O.A.F.)
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 16/10 Miklukho-Maklay Str., Moscow 117997, Russia
| | - Igor B. Sivaev
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Str., Moscow 119991, Russia; (S.A.A.); (K.Y.S.); (O.A.F.)
- Basic Department of Chemistry of Innovative Materials and Technologies, G.V. Plekhanov Russian University of Economics, 36 Stremyannyi Line, Moscow 117997, Russia
- Correspondence: ; Tel.: +7-916-590-2025
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6
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Srb P, Svoboda M, Benda L, Lepšík M, Tarábek J, Šícha V, Grüner B, Grantz-Šašková K, Brynda J, Řezáčová P, Konvalinka J, Veverka V. Capturing a dynamically interacting inhibitor by paramagnetic NMR spectroscopy. Phys Chem Chem Phys 2019; 21:5661-5673. [PMID: 30794275 DOI: 10.1039/c9cp00416e] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Transient and fuzzy intermolecular interactions are fundamental to many biological processes. Despite their importance, they are notoriously challenging to characterize. Effects induced by paramagnetic ligands in the NMR spectra of interacting biomolecules provide an opportunity to amplify subtle manifestations of weak intermolecular interactions observed for diamagnetic ligands. Here, we present an approach to characterizing dynamic interactions between a partially flexible dimeric protein, HIV-1 protease, and a metallacarborane-based ligand, a system for which data obtained by standard NMR approaches do not enable detailed structural interpretation. We show that for the case where the experimental data are significantly averaged to values close to zero the standard fitting of pseudocontact shifts cannot provide reliable structural information. We based our approach on generating a large ensemble of full atomic models, for which the experimental data can be predicted, ensemble averaged and finally compared to the experiment. We demonstrate that a combination of paramagnetic NMR experiments, quantum chemical calculations, and molecular dynamics simulations offers a route towards structural characterization of dynamic protein-ligand complexes.
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Affiliation(s)
- Pavel Srb
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czech Republic.
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7
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Biswas A, Maiti S, Kalaskar DM, Das AK. Redox-Active Dynamic Self-Supporting Thixotropic 3D-Printable G-Quadruplex Hydrogels. Chem Asian J 2018; 13:3928-3934. [DOI: 10.1002/asia.201801409] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Revised: 10/15/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Ankan Biswas
- Department of Chemistry; Indian Institute of Technology Indore; Khandwa Road Indore 453552 India
| | - Sayan Maiti
- Department of Chemistry; Indian Institute of Technology Indore; Khandwa Road Indore 453552 India
| | - Deepak M. Kalaskar
- Institute of Orthopaedics & Musculoskeletal Science, Division of Surgery and Intervention Science; Royal National Orthopaedic Hospital; University College London; Brockely Hill Stanmore, Middlesex HA7 4LP UK
| | - Apurba K. Das
- Department of Chemistry; Indian Institute of Technology Indore; Khandwa Road Indore 453552 India
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8
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Anufriev SA, Erokhina SA, Suponitsky KY, Anisimov AA, Laskova JN, Godovikov IA, Fabrizi de Biani F, Corsini M, Sivaev IB, Bregadze VI. Synthesis and structure of bis(methylsulfanyl) derivatives of iron bis(dicarbollide). J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2018.04.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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9
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Mondal A, Gaultois MW, Pell AJ, Iannuzzi M, Grey CP, Hutter J, Kaupp M. Large-Scale Computation of Nuclear Magnetic Resonance Shifts for Paramagnetic Solids Using CP2K. J Chem Theory Comput 2017; 14:377-394. [DOI: 10.1021/acs.jctc.7b00991] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Arobendo Mondal
- Institut
für Chemie, Theoretische Chemie/Quantenchemie, Technische Universität Berlin, Sekretariat C7, Strasse des 17 Juni 135, D-10623 Berlin, Germany
| | - Michael W. Gaultois
- Department
of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Andrew J. Pell
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-10691 Stockholm, Sweden
| | - Marcella Iannuzzi
- Institut
für Chemie, Universität Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Clare P. Grey
- Department
of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Jürg Hutter
- Institut
für Chemie, Universität Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Martin Kaupp
- Institut
für Chemie, Theoretische Chemie/Quantenchemie, Technische Universität Berlin, Sekretariat C7, Strasse des 17 Juni 135, D-10623 Berlin, Germany
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10
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Patel NCD, Oliva‐Enrich JM, Fox MA. Geometries of 11‐Vertex Carborane Monoanion Radicals with 2
n
+3 Skeletal Electron Counts. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700419] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
| | | | - Mark A. Fox
- Department of Chemistry Durham University DH1 3LE Durham United Kingdom
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11
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Medved' M, Demissie TB, McKee ML, Hnyk D. The behavior of a paramagnetic system in electric and magnetic fields as exemplified by revisiting Li@B 10H 14. Phys Chem Chem Phys 2017; 19:12229-12236. [PMID: 28451659 DOI: 10.1039/c7cp00658f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The electric and magnetic properties of the Li@B10H14 complex, considered as a novel inorganic electride-type system with potential for second-order non-linear optical (NLO) applications, have already been studied. However, the reported C2v structure is not the global energy minimum and therefore its electronic and magnetic properties need to be revisited. Moreover, by applying more accurate computational protocols (ROHF-CCSD/CCSD(T) and larger basis sets) we show that the model chemistry used earlier (UMP2/6-31+G(d)) is not sufficient for reliable description of the NLO responses of this open-shell doublet complex. The global minimum based on the Cs symmetry is significantly (by ca. 25 kcal mol-1) more stable than the C2v structure and it should be viewed as a system with moderate NLO responses. An excess of unpaired electron density is also responsible for the contact and pseudo-contact contributions to the magnetic properties, which was not considered in the earlier work.
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Affiliation(s)
- Miroslav Medved'
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University Olomouc, 17. listopadu 1192/12, CZ-771 46 Olomouc, Czech Republic
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12
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Ligand π-Radical Interaction with f-Shell Unpaired Electrons in Phthalocyaninato-Lanthanoid Single-Molecule Magnets: A Solution NMR Spectroscopic and DFT Study. Chemistry 2015; 21:14421-32. [DOI: 10.1002/chem.201501944] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Indexed: 12/31/2022]
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13
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Cioran AM, Teixidor F, Viñas C. The effect of a paramagnetic metal ion within a molecule: comparison of the structurally identical paramagnetic [3,3-Fe(1,2-C2B9H11)2]− with the diamagnetic [3,3-Co(1,2-C2B9H11)2]− sandwich complexes. Dalton Trans 2015; 44:2809-18. [DOI: 10.1039/c4dt03418j] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Effects on the NMR spectra of a paramagnetic metal ion are clearly observed by comparing identical sandwich molecular structures of diamagnetic [3,3′-Co(1,2-C2B9H11)2]− with paramagnetic [3,3′-Fe(1,2-C2B9H11)2]−.
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Affiliation(s)
- Ana M. Cioran
- Institut de Ciència de Materials de Barcelona (CSIC)
- E-08193 Bellaterra
- Spain
| | - Francesc Teixidor
- Institut de Ciència de Materials de Barcelona (CSIC)
- E-08193 Bellaterra
- Spain
| | - Clara Viñas
- Institut de Ciència de Materials de Barcelona (CSIC)
- E-08193 Bellaterra
- Spain
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14
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Tarrés M, Arderiu VS, Zaulet A, Viñas C, Fabrizi de Biani F, Teixidor F. How to get the desired reduction voltage in a single framework! Metallacarborane as an optimal probe for sequential voltage tuning. Dalton Trans 2015; 44:11690-5. [DOI: 10.1039/c5dt01464f] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A single platform, [M(C2B9H11)2]− (M = Co, Fe) offers the possibility to choose the desired potential in a 1.4 V range without changing shape or volume of the platform. Methyl viologen was used as benchmark for E1/2 tuning.
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Affiliation(s)
- Màrius Tarrés
- Institut de Ciencia de Materials de Barcelona
- ICMAB-CSIC
- E-08193 Bellaterra
- Spain
| | - Víctor S. Arderiu
- Institut de Ciencia de Materials de Barcelona
- ICMAB-CSIC
- E-08193 Bellaterra
- Spain
| | - Adnana Zaulet
- Institut de Ciencia de Materials de Barcelona
- ICMAB-CSIC
- E-08193 Bellaterra
- Spain
| | - Clara Viñas
- Institut de Ciencia de Materials de Barcelona
- ICMAB-CSIC
- E-08193 Bellaterra
- Spain
| | | | - Francesc Teixidor
- Institut de Ciencia de Materials de Barcelona
- ICMAB-CSIC
- E-08193 Bellaterra
- Spain
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15
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Bregadze VI, Dyachenko OA, Kazheva ON, Kravchenko AV, Sivaev IB, Starodub VA. Tetrathiafulvalene-based radical cation salts with transition metal bis(dicarbollide) anions. CrystEngComm 2015. [DOI: 10.1039/c5ce00835b] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Radical cation salts based on derivatives of tetrathiafulvalene and sandwiched transition metal bis(dicarbollide) anions are of great interest in the development of new molecular conducting materials.
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Affiliation(s)
- Vladimir I. Bregadze
- A. N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences
- 119991 Moscow, Russia
| | - Oleg A. Dyachenko
- Institute of Problems of Chemical Physics
- Russian Academy of Sciences
- Moscow Region, Russia
| | - Olga N. Kazheva
- Institute of Problems of Chemical Physics
- Russian Academy of Sciences
- Moscow Region, Russia
| | - Andrey V. Kravchenko
- Department of Chemistry
- V. N. Karazin Kharkiv National University
- Kharkiv, Ukraine
| | - Igor B. Sivaev
- A. N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences
- 119991 Moscow, Russia
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16
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Chemical Shift in Paramagnetic Systems. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/b978-0-444-59411-2.00003-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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17
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Farràs P, Juárez-Pérez EJ, Lepšík M, Luque R, Núñez R, Teixidor F. Metallacarboranes and their interactions: theoretical insights and their applicability. Chem Soc Rev 2012; 41:3445-63. [DOI: 10.1039/c2cs15338f] [Citation(s) in RCA: 101] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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18
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Farràs P, Teixidor F, Rojo I, Kivekäs R, Sillanpää R, González-Cardoso P, Viñas C. Relaxed but highly compact diansa metallacyclophanes. J Am Chem Soc 2011; 133:16537-52. [PMID: 21905695 DOI: 10.1021/ja205850p] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of monoansa [μ-1,1'-PR-3,3'-Co(1,2-C(2)B(9)H(10))(2)](-) and diansa [8,8'-μ-(1'',2''-benzene)-μ-1,1'-PR-3,3'-Co(1,2-C(2)B(9)H(9))(2)](-) (R = Ph, (t)Bu) cobaltabisdicarbollidephanes have been synthesized, characterized and studied by NMR, MALDI-TOF-MS, UV-visible spectroscopy, cyclic voltammetry, and DFT calculations. Single crystal X-ray diffraction revealed a highly relaxed structure characterized by the title angle α of 3.8° ([7](-)), this being the smallest angle α for a metallacyclophane. In such compounds, the metal-to-phosphorus distance is less than the sum of their van der Waals radii. The availability of a phosphorus lone pair causes an electron delocalization through the metal, as shown by the abnormal (31)P NMR chemical shift. Remarkably, the combination of a phosphine donor and a phenyl acceptor moieties causes a synergistic effect that is observed through the different techniques used in this study. The importance of having an available lone pair is demonstrated by the oxidation of phosphorus with hydrogen peroxide, sulfur, and elemental black selenium to produce the corresponding P(V) compounds. When the electron lone pair is used to form the bond with the corresponding chalcogen atom, the communication between the donor and acceptor moieties on the diansa metallacyclophane is shut down.
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Affiliation(s)
- Pau Farràs
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la U.A.B., E-08193 Bellaterra, Spain
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19
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Taubert S, Sundholm D, Jusélius J. Calculation of spin-current densities using gauge-including atomic orbitals. J Chem Phys 2011; 134:054123. [PMID: 21303108 DOI: 10.1063/1.3549567] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The gauge-including magnetically induced current method for calculating the components of the current-density tensor using gauge-including atomic orbitals has been extended to treating open-shell molecules. The applicability of the method is demonstrated by calculations of first-order induced current densities on cyclobutadiene, Al(3), and B(3) at correlated ab initio levels of theory. For comparison, current-density calculations were also performed on the lowest closed-shell singlet state of cyclobutadiene as well on the closed-shell Al(3)(-) and B(3)(-) anions. The ring-current susceptibilities of the open-shell species are computed at the Hartree-Fock self-consistent-field, second-order Møller-Plesset perturbation theory, and coupled-cluster singles and doubles levels, whereas for the closed-shell systems also density functional theory calculations were employed. Explicit values for the current strengths caused by α and β electrons as well as the difference, representing the spin current, were obtained by numerical integration of the current-density contributions passing a plane perpendicular to the molecular ring. Comparisons of the present results to those recently obtained for the lowest triplet state of biphenyl emphasize that electron correlation effects must be considered for obtaining an accurate description of spin-current densities.
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Affiliation(s)
- Stefan Taubert
- Department of Chemistry, P.O. Box 55 (A.I. Virtanens plats 1), University of Helsinki, FIN-00014 Finland.
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