Magnetic electronic Raman optical activity of osmium (IV) hexabromide, iridium (IV) hexachloride and uranocene

Abstract

Abstract Magnetic optical activity is reported in electronic resonance Raman transitions of OsBr , IrCl and U(C 8 H 8 ) 2 in solution. All the effects are observed in the form of couplets which originate in separate Raman transitions between magnetic components of the initial and final levels. These can give detailed information about the magnetic structure of the ground and low‐lying electronic states, particularly the sign of the g‐factor and the ordering of magnetic sub‐states in general. For example, effects in the 466 cm −1 electronic Raman band of U(C 8 H 8 ) 2 confirm that the M J = ±4 level lies below the M J = ±3 level. We also use the magnetic Raman optical activity to identify a very weak U(C 8 H 8 ) 2 Raman band at 675 cm −1 with a vibrational‐electronic combination transition.