The examination of TBP excited state by pulse radiolysis

With pulse radiolysis as well as flash photolysis, acetophenone and benzoph enone have been employed as probles in the determination of the yield of tr ibutyl phosphate excited species (TBP*) in this work. The yield of e(s), G( e(s)) has been determined to be about 1.0 and the total measured yield of T BP* has been estimated to be 1.9. Meanwhile, estimations are also obtained for the rate constants of the following reactions: dissociative electron ca pture (e(s) + TBP --> C4H9. + (C4H9O)(2)P(=O)O-) (k(1) = 9.62 x 10(5) s(-1) ), hydrogen abstraction by triplet benzophenone from TBP to give ketyl radi cal of benzophenone (BH) (k(1) = 6.0 x 10(5) s(-1)). The ratio of the rate constant of the decomposition of TBP* to that of the reaction of the energy transfer from TBP* to benzophenone is 9.6 x 10(-4) mol dm(-3). (C) 1999 El sevier Science Ltd. All rights reserved.