A 31P-SNP study of the photolysis of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide in micelles of different sizes

Article abstract of DOI:10.1016/0009-2614(96)00379-X

31P stimulated nuclear polarization spectra and their dependence on time after photolysis of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide in micellar solution of sodium octyl- (SOS) and dodecylsulfate (SDS) are investigated and discussed in terms of the numerical solution of the stochastic Liouville equation for a microreactor model.The decay of the geminate radical pair is found to be about 2.5 times slower in SDS than in the SOS micelles due to a larger re-encounter rate in the latter one.Simulation of the experimental results further suggests J₀= ca. -1.6*10¹⁰ rad/s for the exchange interaction at contact distance, and an increasing micellar size with increasing radical size.