title: Ultrafast IR spectroscopy of polymeric cytosine nucleic acids reveal the long-lived species is due to a localised state.
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.
authors.affiliation: School of Chemistry and Centre for Synthesis and Chemical Biology, Trinity College, Dublin 2, Ireland.
authors.forename: Páraic M
authors.initials: PM
authors.lastname: Keane
authors.forename: Michal
authors.initials: M
authors.lastname: Wojdyla
authors.forename: Gerard W
authors.initials: GW
authors.lastname: Doorley
authors.forename: John M
authors.initials: JM
authors.lastname: Kelly
authors.forename: Ian P
authors.initials: IP
authors.lastname: Clark
authors.forename: Anthony W
authors.initials: AW
authors.lastname: Parker
authors.forename: Gregory M
authors.initials: GM
authors.lastname: Greetham
authors.forename: Michael
authors.initials: M
authors.lastname: Towrie
authors.forename: Luís M
authors.initials: LM
authors.lastname: Magno
authors.forename: Susan J
authors.initials: SJ
authors.lastname: Quinn
mesh_terms: D001704:Biopolymers / Q000737:chemistry; D003568:Cytidine Monophosphate / Q000737:chemistry*; D004579:Electron Transport; D013055:Spectrophotometry, Infrared; D013997:Time Factors
chemical_list: D001704:Biopolymers; D003568:Cytidine Monophosphate