Abstract
This article describes observations obtained from detailed investigations of the photochemistry of (η 5-C 5R 5)Rh(CO) 2 (R = H, Me) and (HBPz * 3)Rh(CO) 2 (Pz * = 3,5-dimethylpyrazolyl) complexes in hydrocarbon solutions. Photochemical quantum efficiency data have been recorded for ligand photosubstitution and intermolecular Si-H/C-H bond activation processes following excitation at various wavelengths in the visible and near-UV regions. The results obtained, taken in conjunction with prior photochemical measurements (viz. matrix isolation, flash photolysis and low temperature studies in liquefied noble gases) lead to a proposed mechanistic scheme that explains both the ligand photosubstitution and C-H/Si-H bond activation reactions.
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