School of Chemistry and Centre for Synthesis and Chemical Biology, Trinity College, Dublin 2, Ireland.
Phys Chem Chem Phys. 2012 May 14;14(18):6307-11. doi: 10.1039/c2cp23774a. Epub 2012 Feb 22.
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.
使用皮秒时间分辨红外光谱研究了紫外激发的胞嘧啶聚合物的衰变途径。在单链 dC(30) 聚合物和 dCMP 单体中都发现了具有相似非辐射（1）nπ* 态产率的物质，但在聚合物中（80 ps 对 39 ps）的寿命更长。在 d(CpC) 二核苷酸中也发现了更长的寿命。没有观察到激基缔合物态的证据，这表明局域（1）nπ*激发态是皮秒时间尺度上存在的最重要的中间体。
