Vibronically-allowedd-dtransitions and the magnetic circular dichroism of Cu2+complexes

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Abstract
Measurements of the magnetic circular dichroism (M.C.D.) spectra of Cu(NH3)4 2+, Cu(en)2 2+ and Cu(gly)2 2+ at room temperature are described. M.C.D. parameters expected for the vibronically-allowed d-d transitions of tetragonal complexes are calculated, and the observed M.C.D. spectra are analysed and interpreted. Calculations of the vibronically-allowed electric dipole transition moments are made on the basis of the theory proposed by Koide and Pryce. The B term is found to be dominant in the M.C.D. of these Cu2+ complexes at room temperature. The contribution of the C term, which is introduced as an effect of spin-orbit coupling, is considered.