LASER FLASH-PHOTOLYSIS STUDIES ON THE INTERACTION BETWEEN TRIPLET BENZOPHENONE AND NAPHTHOLATE ANIONS - ELECTRON-TRANSFER OR TRIPLET ENERGY-TRANSFER

By means of nanosecond laser flash photolysis it has been found that t he interaction between triplet benzophenone ((BP)-B-3) and naphtholat e anions (NpO-) is not triplet energy transfer but electron transfer t o yield the benzophenone anion (BP-.) and naphthoxy (NpO.) radicals in acetonitrile-H2O (4:1 v/v) at 295 K. From the kinetic parameters for quenching of (BP)-B-3 by NpO- and quantum yields for the formation of BP-. and NpO., it was found that the efficiency for electron transfer between (BP)-B-3 and NpO- is unity due to the triplet spin-multiplic ity of radical pairs.