Studied on heteronuclear intervalence transfer, Part II : Ferricyanides of trivalent cobalt

Department of Chemistry, University College of Science and Technology, Calcutta-9, India., India..

Abstract

Ferricyanides of Co (III) tris phenanthroline and tris bipyridyl have been found to show the intervalence electron transfer effect optically as well as thermally. The ferricyanide of tris ethylene diamine Co (III) however do not show the optical effect at all. It has been suggested that the electron transfer takes from Co (III) to Fe (III) converting Co (III) to Co (IV). The role of ligands in stabilising the Co (IV) stale has been discussed.

Résumé

On observe un transfert électronique entre valences, d’origine optique ou thermique, sur les ferrocyanures de tris-phenanthroline Co (III) et de tris-bipyridyl Co (III). Aucun effet optique n’apparaît pour le ferricyanure de tris-éthylène diamine Co (III). Le Co (III) serait transformé en Co (IV) par transfert électronique de Co (III) à Fe (III). On discute le rôle des ligandes dans la stabilisation de la forme Co (IV).