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Disentangling intrinsic ultrafast excited-state dynamics of cytosine tautomers.
Ho, Jr-Wei; Yen, Hung-Chien; Chou, Wei-Kuang; Weng, Chih-Nan; Cheng, Li-Hao; Shi, Hui-Qi; Lai, Szu-Hsueh; Cheng, Po-Yuan.
Afiliação
  • Ho JW; Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan, ROC.
J Phys Chem A ; 115(30): 8406-18, 2011 Aug 04.
Article em En | MEDLINE | ID: mdl-21699163
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.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Teoria Quântica / Citosina Idioma: En Revista: J Phys Chem A Assunto da revista: QUIMICA Ano de publicação: 2011 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Teoria Quântica / Citosina Idioma: En Revista: J Phys Chem A Assunto da revista: QUIMICA Ano de publicação: 2011 Tipo de documento: Article