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Low-temperature Spectroelectrochemistry of Tetraethylammonium Tris(ethylxanthato)nickelate(II) and Bis(ethylxanthato)nickel(II) Complexes

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One-electron constant potential electrolysis of tetraethylammonium tris(ethylxanthato)nickelate(II), (NEt4)[Ni(S2COEt)3] and bis(ethylxanthato)nickel(II), Ni(S2COEt)2, at their lowest oxidation peak potentials, were followed by in situ UV-VIS spectrophotometry, in acetonitrile at 253 K. In both cases [NiIII(S2COEt)3] complex formed and detected by its electronic absorption and EPR spectra. [NiIII(S2COEt)3] slowly disproportionated to Ni(S2COEt)2 and the dimer of the oxidized ethylxanthate ligand, (S2COEt)2, with a second-order rate law.
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Keywords: Cyclic voltammetry; Nickel(III) complexes; Spectroelectrochemistry; Sulphur donor ligands

Document Type: Research Article

Publication date: 01 January 2002

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