A NOVEL TYPE OF HYDRIDE-TRANSFER PHOTOCATALYSIS BY RU-II-PYRIDINE COMPLEXES - REGIOCONTROLLED REDUCTION OF AN NAD(P) MODEL-COMPOUND BY TRIETHYLAMINE

[Ru(trpy)(bpy)(py)]2(+) (trpy = 2,2' :6',2''-terpyridine, bpy = 2,2'-b ipyridine, py = pyridine) and [Ru(LL)(2)(py)(2)](2+) (LL = a bidentate ligand) photocatalysed the regiocontrolled reduction of 1-benzyl-4-ca rbamoyle-pyridinium cation to the dihydro form with no formation of th e half-reduced dimers, the photocatalysis proceeds through the photosu bstitution of a py ligand of the Ru complexes and the subsequent photo formation of [Ru(trpy)(bpy)H](+) or [Ru(LL)(2)(py)H](+).