Large magnetic field effect on the radical pair generated from the photo-induced electron transfer from skatole to 2,4,6-triphenyl pyrilium tetrafluoroborate in aqueous SDS micellar medium

The effect of external magnetic field on the spin evolution of the radical pair (RP) generated from photo-induced electron transfer from skatole to 2, 4,6-triphenyl pyrilium tetrafluoroborate in aqueous SDS micellar medium has been investigated. The yield of escape radicals gradually increases with i ncreasing field and ultimately reaches saturation. The yield of escaped rad icals at saturating fields is almost four times the corresponding zero-fiel d value. At low fields the magnetic field dependence of the escape yield is ascribed to HFI-Zeeman competition and at relatively higher fields, to the relaxation mechanism induced by anisotropic HFI [delta(hfi)]. A saturation in MFE is observed at high fields, which is a consequence of the competiti on between the spin-rephasing process and the fast escape process, (C) 2000 Elsevier Science B.V. All rights reserved.