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Full-Text Articles in Physical Sciences and Mathematics
Fast Excited-State Deactivation In N(5)-Ethyl-4a-Hydroxyfiavin Pseudobase, Dapeng Zhou, Ekaterina Mirzakulova, Renat Khatmullin, Igor Schapiro, Massimo Olivucci, Ksenija D. Glusac
Fast Excited-State Deactivation In N(5)-Ethyl-4a-Hydroxyfiavin Pseudobase, Dapeng Zhou, Ekaterina Mirzakulova, Renat Khatmullin, Igor Schapiro, Massimo Olivucci, Ksenija D. Glusac
Chemistry Faculty Publications
We present a study of the excited-state behavior of N(5)-ethyl-4a-hydroxyflavin (Et-FlOH), a model compound for bacterial bioluminescence. Using femtosecond pump-probe spectroscopy, we found that the Et-FlOH excited state exhibits multiexponential dynamics, with the dominant decay component having a 0.5 ps lifetime. Several possible mechanisms for fast excited-state decay in Et-FlOH were considered: (i) excited-state deprotonation of the -OH proton, (ii) thermal deactivation via (1)n,pi* -> (1)pi,pi* conical intersection, and (iii) excited-state release of OH(-) ion. These mechanisms were excluded based on transient absorption studies of two model compounds (N(5)-ethyl-4a-methoxyflavin, Et-FlOMe, and N(5)-ethyl-flavinium ion, Et-Fl(+)) and based on the results of …