Disentangling intrinsic ultrafast excited-state dynamics of cytosine tautomers

Jr Wei Ho, Hung Chien Yen, Wei Kuang Chou, Chih Nan Weng, Li Hao Cheng, Hui Qi Shi, Szu Hsueh Lai, Po Yuan Cheng

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)

Abstract

Gas-phase ultrafast excited-state dynamics of cytosine, 1-methylcytosine, and 5-fluorocytosine were investigated in molecular beams using femtosecond pump-probe photoionization spectroscopy to identify the intrinsic dynamics of the major cytosine tautomers. The results indicate that, upon photoexcitation in the first absorption band, the cytosine enol tautomer exhibits a significantly longer excited-state lifetime than its keto and imino counterparts. The initially excited states of the cytosine keto and imino tautomers decay with sub-picosecond dynamics for excitation wavelengths shorter than 300 nm, whereas that of the cytosine enol tautomer decays with time constants ranging from 3 to 45 ps for excitation between 260 and 285 nm.

Original languageEnglish
Pages (from-to)8406-8418
Number of pages13
JournalJournal of Physical Chemistry A
Volume115
Issue number30
DOIs
Publication statusPublished - 2011 Aug 4

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

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