Excited-state dynamics of cytosine tautomers.
We report the relaxation dynamics of keto and enol or keto-imino cytosine, photoexcited in the wavelength range of 260-290 nm. Three transients with femtosecond to hundreds of picoseconds lifetimes are observed for the biologically relevant keto tautomer and are assigned to internal conversion and excited-state tautomerization. Only two transients with femtosecond and picosecond lifetimes are identified for the enol or keto-imino tautomer and are assigned to internal conversion processes. The results are discussed in the context of published ab initio theory.
Kosma
Kyriaki
K
Max Born Institute, Max-Born-Strasse 2A, D-12489, Berlin-Adlershof, Germany.
Schröter
Christian
C
Samoylova
Elena
E
Hertel
Ingolf Volker
IV
Schultz
Thomas
T
D003596:Cytosine / Q000737:chemistry*; D004247:DNA / Q000737:chemistry* / Q000528:radiation effects*; D007536:Isomerism; D055668:Photochemical Processes
D003596:Cytosine; D004247:DNA