Charge-transfer complexes of iodine with diphenyl sulphides

Abstract

Charge transfer complexes of iodine (a σ acceptor) with mono- and di-substituted diphenyl sulphides have been studied in cyclohexane at 25°. Spectral data, stability constants, and thermal parameters are reported. The data fit the Hammett equation with ρ values of –0·64 and –0·43 for mono- and di-substitution, respectively. The stability–structure correlation is discussed in terms of electronic and steric factors and gives information on the conjugative contribution from the π system to the interaction of the sulphur lone pair with iodine.