ELECTRON-TRANSFER REACTIONS MEDIATED BY ACRIDINE TRIPLET-STATE IN AQUEOUS-SOLUTIONS - TRIPLET ENERGY-TRANSFER FROM RU(BIPY)3(2+) AND PHOTOSENSITIZED ELECTRON-TRANSFER FROM PARA-SUBSTITUTED PHENOLS TO METHYL VIOLOGEN

Laser flash photolysis experiments are described which demonstrate triplet energy transfer from tris(2,2'-bipyridine)ruthenium(II) to acridine, acridine-9-carboxylate and phenazine, and electron transfer from para-substituted phenols to methyl viologen mediated by the triplet state of acridine-9-carboxylate. The latter reaction occurs via reductive quenching of the triplet state. Rate constants and efficiencies of these reactions are reported.