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Influence of aromatic ligand on the redox activity of neutral binuclear tetranitrosyl iron complexes [Fe2(l-SR)2(NO)4]: experiments and quantum-chemical modelingстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 3 февраля 2015 г.
- Авторы: Sanina N.A., Krivenko A.G., Manzhos R.A., Emel’yanova N.S., Kozub G.I., Korchagin D.V., Shilov G.V., Kondrat’eva T.A., Ovanesyan N.S., Aldoshin S.M.
- Журнал: New Journal of Chemistry
- Том: 38
- Номер: 1
- Год издания: 2014
- Издательство: Royal Society of Chemistry
- Местоположение издательства: United Kingdom
- Первая страница: 292
- Последняя страница: 301
- DOI: 10.1039/c3nj00704a
- Аннотация: Reduction of neutral binuclear nitrosyl iron complexes of "mu-S" structural type [Fe-2(SR)(2)(NO)(4)] with R = 3-nitro-phenol-2-yl, 4-nitro-phenol-2-yl, 5-nitropyridine-2-yl and pyridine-2-yl in aprotic solution has been studied by a cyclic voltammetry (CVA) method at a wide range of potential scan rates. A complex with R = 3-nitro-phenol-2-yl was synthesized for the first time; therefore it was studied by X-ray and Mossbauer spectroscopy. The parameters of the Mossbauer spectrum are: isomer shift delta(Fe) = 0.115(1) mm s(-1), quadrupole splitting Delta E-Q = 1.171(1) mm s(-1), and line width = 0.241(1) mm s(-1) at 85 K. From the current-voltage curve, the transfer of the first electron was found to be reversible, and the redox-potentials of these reactions were determined. The further reduction of the complexes was determined to be irreversible because the product of the second electron addition is instable and decomposes partially during the potential scan. Calculations of geometric and electronic structures of monoanions and dianions of the complexes under study and their theoretical redox-potentials were performed by DFT methods. Introduction of the electron-acceptor NO2 group into the phenyl and pyridine rings of sulfur-containing ligands of the nitrosyl iron complexes was found to affect the geometry of the anions and the distribution of the additional negative charge, as well as to increase the redox-potential and to facilitate reduction of these complexes.
- Добавил в систему: Шилов Геннадий Викторович