Abstract
Abstract The electronic absorption spectra of the solid tetrabutylammonium salts of [OsClnBr6-n ]2-, n = 0-6, including the stereoisomers for n = 2, 3, 4, are measured at 10 K. The weak intraconfigurational excitations within the t2g 4, manifold of Os(lV) are split by spin orbit coupling and lowered symmetry into multiplets, observed in the NIR regions 2600-3100, 4800-5400, 10 500-11 400 and 16 000 17 200 cm-1. The 0-0-transitions are deduced from vibrational fine structure and they are confirmed by electronic Raman bands with the same frequencies
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