The RS· radical and the RSSR– radical anion of penicillamine have λmax 330 nm, ε330 1·22 × 103M–1 cm–1 and λmax 450 nm, ε450 7·5 × 103M–1 cm–1, respectively, and K1 for the equilibrium, RS·+ RS–⇄ RSSR– is 2·5 × 102M–1 at pH 8.
J. W. Purdie, H. A. Gillis and N. V. Klassen, J. Chem. Soc. D, 1971, 1163 DOI: 10.1039/C29710001163
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