The preparation and electrochemistry of cysteine-ester oxovanadium(IV) complexes |
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| Affiliation: | 1. Department of Chemistry, University of Cyprus, 1678 Nicosia, Cyprus;2. Department of Agricultural Sciences, Biotechnology and Food Science, Cyprus University of Technology, Lemesos 3036, Cyprus;3. Department of Chemistry, Section of Inorganic and Analytical Chemistry, University of Ioannina, 45110 Ioannina, Greece |
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| Abstract: | An improved synthesis of VO(CysOCH3)2, (CysOCH3 the anion of cysteine methyl ester), is reported, as is an analogous preparation of VO(CysOCH2CH3)2, (CysOCH2CH3 the anion of cysteine ethyl ester). These are the first two examples of isolated vanadium-cysteine compounds. The oxidation of VO(CysOCH3)2 in DMSO is a reversible one electron change at 0.24 V versus SCE followed by a rapid chemical reaction which produces a stable vanadium(V) species. This species is reduced back to the vanadium(IV) complex at −1.30 V. The electrochemistry of VO(Cys-OCH2CH3)2 is nearly identical to that of the methyl ester compound. |
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