Charge transfer spectra of some gold(III) complexes

Abstract

Tetrahalo complexes of Au(III) show two intense bands in the ultraviolet. These are interpreted as charge‐transfer bands; the transfer is from halogen p to gold d orbitals. The two bands are associated with p_σ→d_x²—y2 and p_π→d_x²—y² transitions. The iodo complex undergoes spontaneous reduction; reason for this is discussed. The ethylenediamine complexes of Au(III) also exhibit interesting charge‐transfer phenomenon.