Electric quadrupole contributions to the optical activity of crystalline transition metal complexes

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Abstract
It is shown that the circular dichroism data from crystalline transition metal complexes of D 3 symmetry provides evidence for electric dipole-electric quadrupole contributions to the optical activity, as distinct from the usual electric dipole-magnetic dipole mechanism. Specifically, in the 1 A 1→1 E(T 2g ) transition, which is electric quadrupole allowed and magnetic dipole forbidden in the parent Oh complex, and the high frequency charge-transfer transitions of E symmetry, could provide significant electric quadrupole contributions to the circular dichroism. The electric quadrupole rotational strength obeys the Condon sum rule.