Disentangling intrinsic ultrafast excited-state dynamics of cytosine tautomers.
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.
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01-internacional
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MEDLINE
Assunto principal:
Teoria Quântica
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Citosina
Idioma:
En
Revista:
J Phys Chem A
Assunto da revista:
QUIMICA
Ano de publicação:
2011
Tipo de documento:
Article