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Pluczyk-Malek S, Honisz D, Akkuratov A, Troshin P, Lapkowski M. Tuning the electrochemical and optical properties of donor-acceptor D-A2-A1-A2-D derivatives with central benzothiadiazole core by changing the A2 strength. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2020.137540] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Šimková L, Klíma J, Lušpai K, Malček M, Rockenbauer A. In situ simultaneous electrochemical ESR study of radicals generated from 2,2-dinitroethene-1,1-diamine (FOX-7). Intramolecular chemical exchange resulting in an alternation line-width effect. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2021; 323:106895. [PMID: 33429171 DOI: 10.1016/j.jmr.2020.106895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 12/03/2020] [Accepted: 12/15/2020] [Indexed: 06/12/2023]
Abstract
The molecule of 2,2-dinitroethene-1,1-diamine (FOX-7) is one of the most interesting molecules with multiple redox centres stabilized by push-pull effect. To reveal the detailed mechanism of its electrochemical process radical intermediates formed in the course of its electrochemical reduction in organic aprotic media have been studied by in situ simultaneous electrochemical ESR measurements (SEESR). The radical generated on the second reduction step possesses an alternating line-width (AL) effect in the ESR spectra as a result of intramolecular dynamic processes in the timescale of ESR splitting constants. The spectra measured at different temperatures (230-335 K) were analysed with the help of a fitting program which includes a molecular dynamics. Observed dynamics describes well an asymmetric 2-site exchange model for the whole temperature range. With help of the optimized parameters and quantum chemical calculations this radical has been identified as 2,2-dinitroethane-1-amine-1-imine radical dianion, [(H2N)(HN)C=C(NO2)2]2-. The dynamic process responsible for the AL effect consists of mutual turning (changing of dihedral angle) of the both nitro groups, resulting in an intramolecular spin-density (electron) transfer. The dynamic parameters of the process have been established.
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Affiliation(s)
- Ludmila Šimková
- Department of Molecular Electrochemistry and Catalysis, J. Heyrovský Institute of Physical Chemistry, Academy of Sciences, Dolejškova 2155/3, CZ-18223 Prague 8, Czech Republic
| | - Jiří Klíma
- Department of Molecular Electrochemistry and Catalysis, J. Heyrovský Institute of Physical Chemistry, Academy of Sciences, Dolejškova 2155/3, CZ-18223 Prague 8, Czech Republic
| | - Karol Lušpai
- Department of Molecular Electrochemistry and Catalysis, J. Heyrovský Institute of Physical Chemistry, Academy of Sciences, Dolejškova 2155/3, CZ-18223 Prague 8, Czech Republic; Department of Physical Chemistry, Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, SK-81237 Bratislava, Slovak Republic.
| | - Michal Malček
- Department of Physical Chemistry, Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, SK-81237 Bratislava, Slovak Republic
| | - Antal Rockenbauer
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary; Department of Physics, Budapest University of Technology and Economics, Budafoki út 8, H-1111 Budapest, Hungary
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Malček M, Kožíšková J, Herich P, Rapta P, Stepanenko I, Arion VB. Formation of metal-radical species upon reduction of late transition metal complexes with heteroleptic ligands: an experimental and theoretical study. NEW J CHEM 2020. [DOI: 10.1039/d0nj02447c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Three novel transition metal complexes with selenadiazoloquinolones as potential broad spectrum antibiotics in clinical praxis.
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Affiliation(s)
- Michal Malček
- Institute of Physical Chemistry and Chemical Physics
- Faculty of Chemical and Food Technology
- Slovak University of Technology in Bratislava
- SK-812 37 Bratislava
- Slovak Republic
| | - Júlia Kožíšková
- Institute of Physical Chemistry and Chemical Physics
- Faculty of Chemical and Food Technology
- Slovak University of Technology in Bratislava
- SK-812 37 Bratislava
- Slovak Republic
| | - Peter Herich
- Institute of Physical Chemistry and Chemical Physics
- Faculty of Chemical and Food Technology
- Slovak University of Technology in Bratislava
- SK-812 37 Bratislava
- Slovak Republic
| | - Peter Rapta
- Institute of Physical Chemistry and Chemical Physics
- Faculty of Chemical and Food Technology
- Slovak University of Technology in Bratislava
- SK-812 37 Bratislava
- Slovak Republic
| | - Iryna Stepanenko
- Institute of Inorganic Chemistry of the University of Vienna
- A1090 Vienna
- Austria
| | - Vladimir B. Arion
- Institute of Inorganic Chemistry of the University of Vienna
- A1090 Vienna
- Austria
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Wang P, Yang Z, Wang Z, Xu C, Huang L, Wang S, Zhang H, Lei A. Electrochemical Arylation of Electron-Deficient Arenes through Reductive Activation. Angew Chem Int Ed Engl 2019; 58:15747-15751. [PMID: 31433101 DOI: 10.1002/anie.201909600] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Indexed: 01/28/2023]
Abstract
An electrochemical method has been developed to achieve arylation of electron-deficient arenes through reductive activation. Various electron-deficient arenes and aryldiazonium tetrafluoroborates are amenable to this transformation within the conditions of an undivided cell, providing the desired products in up to 92 % yield. Instead of preparing diazonium reagents, these reactions can begin from anilines, and they can be carried out in one pot. Electron paramagnetic resonance studies indicate that cathodic reduction of quinoxaline occurs using the transformation. Moreover, cyclic voltammetry indicates that both quinoxaline and aryl diazonium salt have relatively low reduction potentials, which suggests they can be activated through reduction during the reaction.
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Affiliation(s)
- Pan Wang
- Institute for Advanced Studies (IAS), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, Hubei, P. R. China
| | - Zhenlin Yang
- Institute for Advanced Studies (IAS), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, Hubei, P. R. China
| | - Ziwei Wang
- Institute for Advanced Studies (IAS), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, Hubei, P. R. China
| | - Chenyang Xu
- Institute for Advanced Studies (IAS), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, Hubei, P. R. China
| | - Lei Huang
- Institute for Advanced Studies (IAS), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, Hubei, P. R. China
| | - Shengchun Wang
- Institute for Advanced Studies (IAS), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, Hubei, P. R. China
| | - Heng Zhang
- Institute for Advanced Studies (IAS), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, Hubei, P. R. China
| | - Aiwen Lei
- Institute for Advanced Studies (IAS), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, Hubei, P. R. China.,National Research Center for Carbohydrate Synthesis, Jiangxi Normal University, Nanchang, 330022, P. R. China
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Wang P, Yang Z, Wang Z, Xu C, Huang L, Wang S, Zhang H, Lei A. Electrochemical Arylation of Electron‐Deficient Arenes through Reductive Activation. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201909600] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Pan Wang
- Institute for Advanced Studies (IAS) College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 Hubei P. R. China
| | - Zhenlin Yang
- Institute for Advanced Studies (IAS) College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 Hubei P. R. China
| | - Ziwei Wang
- Institute for Advanced Studies (IAS) College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 Hubei P. R. China
| | - Chenyang Xu
- Institute for Advanced Studies (IAS) College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 Hubei P. R. China
| | - Lei Huang
- Institute for Advanced Studies (IAS) College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 Hubei P. R. China
| | - Shengchun Wang
- Institute for Advanced Studies (IAS) College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 Hubei P. R. China
| | - Heng Zhang
- Institute for Advanced Studies (IAS) College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 Hubei P. R. China
| | - Aiwen Lei
- Institute for Advanced Studies (IAS) College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 Hubei P. R. China
- National Research Center for Carbohydrate Synthesis Jiangxi Normal University Nanchang 330022 P. R. China
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