5-6-trimethyleneuracil and pyrimidine

5-6-trimethyleneuracil has been researched along with pyrimidine* in 1 studies

Other Studies

1 other study(ies) available for 5-6-trimethyleneuracil and pyrimidine

Article	Year
Highly effective quenching of the ultrafast radiationless decay of photoexcited pyrimidine bases by covalent modification: photophysics of 5,6-trimethylenecytosine and 5,6-trimethyleneuracil. Physical chemistry chemical physics : PCCP, 2007, Jul-07, Volume: 9, Issue:25 5,6-Trimethylenecytosine (TMC) and 5,6-trimethyleneuracil (TMU), in which the twist of the C5-C6 bond (or the pyrimidalization of C5) is strongly hindered, do not exhibit the subpicosecond excited-state lifetime characteristic of the naturally occurring pyrimidine bases. This result demonstrates the important role the out-of-plane deformation of the six-membered ring plays in the ultrafast (subpicosecond) internal conversion of photoexcited nucleobases. The dramatically shorter fluorescence lifetime of TMU ( approximately 30 ps) relative to TMC ( approximately 1.2 ns), in aqueous solution at room temperature, is attributed to the presence in TMU of an efficient, secondary nonradiative decay channel of S(1)(pipi) involving a low-lying (1)npi state. Topics: Carbon; Cytosine; Fluorescence; Hydrogen-Ion Concentration; Molecular Structure; Photochemistry; Pyrimidines; Spectrometry, Fluorescence; Thermodynamics; Time Factors; Uracil	2007

Article

Year

Highly effective quenching of the ultrafast radiationless decay of photoexcited pyrimidine bases by covalent modification: photophysics of 5,6-trimethylenecytosine and 5,6-trimethyleneuracil.

Physical chemistry chemical physics : PCCP, 2007, Jul-07, Volume: 9, Issue:25

5,6-Trimethylenecytosine (TMC) and 5,6-trimethyleneuracil (TMU), in which the twist of the C5-C6 bond (or the pyrimidalization of C5) is strongly hindered, do not exhibit the subpicosecond excited-state lifetime characteristic of the naturally occurring pyrimidine bases. This result demonstrates the important role the out-of-plane deformation of the six-membered ring plays in the ultrafast (subpicosecond) internal conversion of photoexcited nucleobases. The dramatically shorter fluorescence lifetime of TMU ( approximately 30 ps) relative to TMC ( approximately 1.2 ns), in aqueous solution at room temperature, is attributed to the presence in TMU of an efficient, secondary nonradiative decay channel of S(1)(pipi*) involving a low-lying (1)npi* state.

Topics: Carbon; Cytosine; Fluorescence; Hydrogen-Ion Concentration; Molecular Structure; Photochemistry; Pyrimidines; Spectrometry, Fluorescence; Thermodynamics; Time Factors; Uracil

2007