Excited-state dynamics of cytosine tautomers.
- Citation data:
Journal of the American Chemical Society, ISSN: 1520-5126, Vol: 131, Issue: 46, Page: 16939-43
- Publication Year:
- Repository URL:
- Chemical Engineering; Chemistry; Biochemistry, Genetics and Molecular Biology; Ab initio theory; Excited-state dynamics; Femtoseconds; Imino tautomers; Internal conversions; Picoseconds; Relaxation dynamics; Tautomerizations; Wavelength ranges
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.