COPPER(II)-DISULFIDE INTERACTION - A SPECTROSCOPIC AND ELECTROCHEMICAL STUDY OF THE INTERACTION OF COPPER(II) WITH AN IMIDAZOLE-CONTAINING DISULFIDE

The interaction of copper(II) salts with the imidazole-containing disu lphide 1,2,5-dithiazaepan-5-ylmethylene)-4-methyl-2-ethyl imidazole (M AMI) in MeOH have been investigated. The 1:1 Cu(ClO4)(2):MAMI system e xhibited a single ligand field band at ca. 12200 cm(-1), an intense sh oulder at ca. 31500 cm(-1) and a less intense split feature at 24400 a nd 25300 cm(-1) assignable to S(sigma)-->Cu-II and S(pi)-->Cu-II charg e transfer (CT) transitions, respectively. The e.p.r. parameters sugge sted the presence of a CuN2SO chromophore, however; the 1:1 Cu(NO3)(2) :MAMI system did not exhibit a S-->Cu-II CT band and the g(parallel to ) value was comparatively high. An electrochemical study of the 1:1 Cu (ClO4)(2):MAMI system in MeOH revealed that the copper-disulphide inte raction, though weaker, would confer a high redox potential as well as reversibility, similar to the copper-thioether interaction.