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Issue 9, 1983
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Electron spin resonance studies. Part 66. Characterization of copper(II) complexes in the oxidation of D-penicillamine, L-cysteine, and related sulphur-containing compounds

Abstract

E.s.r. spectroscopy has been employed to characterize a series of copper(II)–dithiolate complexes formed in aqueous solution at pH ca. 10. Some examples, e.g. that from D-penicillamine [Cu(D-pen)2], are long-lived whereas rapid-flow and fast-freezing methods are required for the study of more transient species (e.g. the analogous complex from L-cysteine). Spectra have been described for related copper complexes of S2N2, S2O2, and S4 type and both isotropic and anisotropic parameters are interpreted in terms of significant spin-delocalization onto S (especially) and N ligands. Some transient ternary complexes [e.g. from L-cysteine and mercaptoethanoic acid)] have also been identified. Stopped-flow experiments on the kinetics of the (second-order) decay of the transient complexes reveal the importance of steric and electronic effects in governing their lifetimes.

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Article information


J. Chem. Soc., Perkin Trans. 2, 1983, 1763-1771
Article type
Paper

Electron spin resonance studies. Part 66. Characterization of copper(II) complexes in the oxidation of D-penicillamine, L-cysteine, and related sulphur-containing compounds

F. J. Davis, B. C. Gilbert, R. O. C. Norman and M. C. R. Symons, J. Chem. Soc., Perkin Trans. 2, 1983, 1763
DOI: 10.1039/P29830001763

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