Ultrafast IR spectroscopy of polymeric cytosine nucleic acids reveal the long-lived species is due to a localised state |
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Authors: | Keane Páraic M Wojdyla Michal Doorley Gerard W Kelly John M Clark Ian P Parker Anthony W Greetham Gregory M Towrie Michael Magno Luís M Quinn Susan J |
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Affiliation: | School of Chemistry and Centre for Synthesis and Chemical Biology, Trinity College, Dublin 2, Ireland. |
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Abstract: | 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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