Ultrafast pump-probe studies of tert-butyl aroylperbenzoates and triplet energy interception by the OO bond

…, A Gusev, MAJ Rodgers, DC Neckers

Index: Shah, Bipin K.; Neckers, Douglas C. Journal of the American Chemical Society, 2004 , vol. 126, # 6 p. 1830 - 1835

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Citation Number: 6

Abstract

Photolysis of tert-butyl aroylperbenzoates (BAPs) 1-4 in benzene and acetonitrile at 335 or 267 nm produces the S1 states (λmax≈ 590 nm) that rapidly intersystem cross (k ISC≈ 1.3× 1011 s-1) into the triplet states (λmax≈ 560 nm, τT= 0.6-0.7 ns in benzene). Results from the 267 nm excitation experiments of 1 in acetonitrile suggest the rate of the S2→ S1 internal conversion (k S2→ S1= 1.6× 1012 s-1) is similar to that of benzophenone and p- ...