Magnetic Circular Dichroism of Charge-Transfer Transitions: Low-Spin d5 Hexahalide Complexes

Abstract

The magnetic circular dichroism (MCD) of IrCl₆²⁻, IrBr₆²⁻, and RuBr₆³⁻ have been measured through the visible and near ultraviolet. Analysis leads to new assignments of the ligand‐to‐metal ${\mathrm{(t}}_{\text{2g}})$ charge‐transfer bands. In particular, the conventional order of the first two allowed charge‐transfer states is reversed so that the ${}^2{T}_{\text{1u}}$ state lies at lower energy than ${}^2{T}_{\text{2u}}$ .