This article summarizes two major areas of research, electron transfer and organometallic photochemistry, addressed during the last dozen or so years. The article emphasizes aspects of the mechanisms of photochemical reactions of transition metal complexes in these two areas. Excited state electron transfer and photoreactions of organometallic complexes have been, and will be, major areas of research opportunity. Practical applications may come in the fields of energy conversion and catalysis. (Author).

Progress on 6 projects is reported: excited state absorption spectrum of Ru(bpy)[sub 3][sup 2+], solvent cage model for electron transfer quenching, reductive quenching of [sup *]Cr(III) complexes, solution medium effects in oxidative quenching of [sup *]Ru(II) complexes, photosensitized oxidation of phenol in aqueous solution, and quenching of Ru(II) complexes by oxygen.