Magnetic circular dichroism spectra of some nickel(II) complexes. Part II. Magnetic circular dichroism of d–d transitions in octahedral nickel(II) complexes in solution

Abstract

The magnetic circular dichroism spectra of the complexes [NiL₆]²⁺(L = H₂O, NH₃, or dimethyl sulphoxide) and [NiL′₃]²⁺(L′= ethylenediamine or 2,2′-bipyridyl) have been measured in solution at room temperature. All the spectra are dominated by B and C terms which arise respectively from the second-order Zeeman effect and spin–orbit coupling interactions between the ³A_2g ground state and ³T_2g excited state. No A terms are observed and in most cases first-order C terms associated with the different spin–orbit components of the particular transition are swamped. Pronounced vibrational structure is observed when the ¹aE state is close to the ³T_2g state.