稀有三环核苷衍生物的光谱学研究  

SPECTRAL STUDIES OF DERIVATIVE OF TRICYCLIC MODIFIED NUCLEOSIDE IN AQUEOUS SOLUTIONS

作　　者：赵红卫[1] 窦大营[1] 苗金玲[1] 姚思德[1] 江致勤[2] 赵春雷[2] 

机构地区：[1]中国科学院上海原子核研究所辐射化学开放实验室,上海201800 [2]同济大学化学系,上海200092

出　　处：《辐射研究与辐射工艺学报》2002年第4期241-245,共5页Journal of Radiation Research and Radiation Processing

基　　金：国家自然科学基金 (2 0 0 72 0 2 5 );中国科学院前沿领域项目资助

摘　　要：利用时间分辨激光光解技术对稀有三环核苷的前体化合物N - 4-desmethylwyosine(dYt)研究发现 ,该化合物能被 2 4 8nm激光单光子电离 ,但未观察到明显的激发三线态。用氧化性自由基SO4 · - 引发其阳离子自由基 ,揭示了其光电离机理。以KI溶液为参照 ,测得该化合物中性条件下的光电离量子产额 (Φe- )为 0 .0 4。The absorption spectra of N-4-desmethylwyosine (dYt), a derivative of the tricyclic modified nucleoside wyosine, in aqueous solutions were studied by time-resolved laser photolysis. The oxidizing radical SO 4 ·- was used to produce dYt radical cation. The mechanism of dYt monophotonic ionization was suggested. Distinct triplet was not observed in this work. The quantum yield of formation of hydrated electrons ( Φ e -) was determined to be 0.04 at room temperature in neutral aqueous solution by using KI solution as a reference.

关 键 词：稀有三环核苷衍生物 单光子电离 自由基 激光光解 瞬态吸收光谱 

分 类 号：O644.18[理学—物理化学]