CIDEP of transient radical-ion pair: Photolysis of N,N,N′,N′-tetramethyl- p-phenylenediamine in 2-propanol

Abstract

Anomalously spin-polarized solvated electrons produced by photoejection from N,N,N′,N′-tetramethyl- p-phenylenediamine in 2-propanol were detected by using a time-resolved ESR technique. The emission/absorption pattern of the CIDEP spectrum was observed immediately after laser excitation; thereafter it gradually changed to enhanced absorption. These two patterns may be attributable to the appearance of the exchange interaction in a radical-ion pair and the ordinary ST 0 mixing, respectively. These data lead to the conclusion that the sign of J is positive in this system.