Photoenhanced catalytic dehydrogenation of propan-2-ol with homogeneous rhodium–tin complexes

Abstract
The effect of photoirradiation was investigated for the catalytic dehydrogenation of propan-2-ol with homogeneous rhodium–tin complexes. A large reduction of activation energy from 117 to 11 kJ mol–1 was observed. The wavelength dependence of quantum efficiency showed that it exceeded unity in the u.v. region with an appropriate catalyst composition. A mechanism is proposed, in which the generation of co-ordinatively unsaturated catalytically active species by the photocleavage of the Rh–Sn co-ordination bond is assumed. Photocatalysis in endothermic reactions is discussed from the viewpoint of solar energy storage.

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