✦ LIBER ✦

Properties of the red - violet complex of copper and penicillamine and further insight into its formation reaction

✍ Scribed by John R. Wright; Earl Frieden

Book ID: 104106062
Publisher: Elsevier Science
Year: 1975
Weight: 815 KB
Volume: 4
Category: Article
ISSN: 0006-3061
DOI: 10.1016/s0006-3061(00)81025-x

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✦ Synopsis

A characteristic red-violet chromophore which forms in the reaction of cupric ion with p-sulfhydryl-a-amino acids has been attributed by several authors to a mixed-vaIence Cu, L, structure. We have isolated and examined the analogous chromophore of the chelating drug penicitlamine #,@-climethyIcysteine), finding instead a poiymeric anion with a mixed vaIence Cu,L, repeaticg unit_ Direct evidence for a mixed valence polymer cooroborates earlier conclusions of Wilson and Martin [9]_ Under oxygen-free conditions the anionic complex forms in essentially quantitative yield according to the following reaction:

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