Femtosecond Fluorescence Anisotropy Studies of Excited-State Intramolecular Double-Proton Transfer in [2,2‘-bipyridyl]-3,3‘-diol in Solution
作者： P. Toele , H. Zhang , M. Glasbeek
DOI: 10.1021/JP0134446
关键词:
摘要: For [2,2‘-bipyridyl]-3,3‘-diol (BP(OH)2), dissolved in aprotic solvents, the time dependence of fluorescence anisotropy has been studied using femtosecond up-conversion technique. A fast decay, with a characteristic ∼350 fs, is observed when detection at 460 nm, i.e., near blue edge BP(OH)2 broad-band emission. It discussed that decay typical emission from “di-enol” excited Franck−Condon state for which lifetime limited by first steps branched excited-state double double-proton-transfer process. The reaction includes concerted and consecutive double-proton-transfer. into “mono-keto” “di-keto” states indicative (quasi-)barrierless reaction. To explain rapid (∼350 fs) initial manifested anisotropy, it conjectured electronic wave function emissive re...
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