2-DIMENSIONAL FT-EPR SPECTROSCOPY FOR SPIN-CORRELATED RADICAL PAIRS -APPLICATION TO PHOTOINDUCED ELECTRON-TRANSFER REACTION BETWEEN ZNTPPSAND DQ IN A MICELLAR SOLUTION

Two pulsed EPR methods for studying spin-correlated radical pairs (SCR Ps) transiently generated in photochemical reactions are presented. On e is two dimensional (2D) EPR nutation method which uses anomalous fli p angle dependence of SCRPs for microwave (MW) pulses and the other is application of the so called 2D J spectroscopy in NMR to studies of p aramagnetic SCRPs. The methods were applied to observation of the SCRP generated in the photoinduced electron transfer reaction between zinc tetraphenylporphyrinsulphonate (ZnTPPS) and duroquinone (DQ) in cetylt rimethylammonium chloride (CTAC) micellar solution in which SCRP alive s for a relatively long period at the early stage of the reaction proc esses.