One-electron redox potentials of RSSR+˙–RSSR couples from dimethyl disulphide and lipoic acid
- 1 January 1986
- journal article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 11,p. 1805-1809
- https://doi.org/10.1039/p29860001805
Abstract
One-electron redox potentials have been measured for three (RSSR)+˙/RSSR couples by reference to (SCN)2 –˙/2 SCN– and/or I2 –˙/2 I– in pulse radiolysis experiments: E°(CH3SSCH3 +˙/CH3SSCH3)+(1.391 ± 0.003) V; E°[lip(SS)COOH +˙/lip(SS)COOH]+(1.13 ± 0.01) V; and E°[lip(SS)COO– +˙/lip(SS)COO–]+(1.10 ± 0.01) V [lip(SS)= lipoic acid]. The paper also includes equilibrium constants for the underlying RSSR + X2 –˙ RSSR+˙+ 2 X– equilibria (X = SCN or I), and rate constants for the respective back and/or forward reactions. The results are discussed in the light of structural considerations and in relation to other redox couples involving sulphur-centred radical species.Keywords
This publication has 0 references indexed in Scilit: