- Ultrafast IR spectroscopy of polymeric cytosine nucleic acids reveal the long-lived species is due to a localised state.
Ultrafast IR spectroscopy of polymeric cytosine nucleic acids reveal the long-lived species is due to a localised state.
Physical chemistry chemical physics : PCCP (2012-02-24)
Páraic M Keane, Michal Wojdyla, Gerard W Doorley, John M Kelly, Ian P Clark, Anthony W Parker, Gregory M Greetham, Michael Towrie, Luís M Magno, Susan J Quinn
PMID22358255
摘要
The decay pathways of UV-excited cytosine polymers are investigated using picosecond time-resolved infrared spectroscopy. Similar yields of a non-emissive (1)nπ* state are found in the single-stranded dC(30) polymer as in the dCMP monomer, but with a longer lifetime in the polymer (80 ps vs. 39 ps). A longer lifetime is also found in the d(CpC) dinucleotide. No evidence of excimer states is observed, suggesting that localised (1)nπ* excited states are the most significant intermediates present on the picosecond timescale.
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