期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 133, 期 12, 页码 4212-4215出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja1106089
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资金
- EU [App81030]
- SFI [06/RFP/CHP035, 07/RFP/CHEF437]
- Science Foundation Ireland (SFI) [07/RFP/CHEF437, 06/RFP/CHP035] Funding Source: Science Foundation Ireland (SFI)
The role of N1-substitution in controlling the deactivation processes in photoexcited cytosine derivatives has been explored using picosecond time-resolved IR spectroscopy. The simplest N1-substituted derivative, 1-methyl-cytosine, exhibits relaxation dynamics similar to the cytosine nucleobase and distinct from the biologically relevant nucleotide and nucleoside analogues, which have longer-lived excited-state intermediates. It is suggested that this is the case because the sugar group either facilitates access to the long-lived (1)n(O)pi* state or retards its crossover to the ground state.
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