中文摘要：

选择氧杂蒽酮（XAN）为探针分子,利用纳秒级瞬态光解技术研究在1-丁基-3-甲基咪唑六氟磷酸盐离子液体（[bmim][PF6]）以及离子液体与常规溶剂中的光化学行为,探索不同溶剂对氧杂蒽酮激发三线态态（3 XAN＊）的最大吸收峰的影响：3 XAN＊在纯乙腈（MeCN）中的吸收峰在630nm,而在[bmim][PF6]作溶剂的体系中激发态的吸收峰发生蓝移,而且纯离子液体体系中3 XAN＊的产额显著增加。进一步探索离子液体对光诱导3 XAN＊与萘（NAP）之间的能量转移及与N,N-二甲基苯胺（DMA）之间的电子转移的影响,结果表明：[bmim][PF6]/MeCN的二元体系中随着[bmim][PF6]浓度的增大,氧杂蒽酮与萘之间的能量转移速率减小,测得在乙腈和纯离子液体中3 XAN＊与NAP之间能量转移速率常数分别为1.2×1010 mol·L-1·s-1和1.1×108 mol·L-1·s-1。

英文摘要：

The transient photochemical behavior of xanthone（XAN） in 1-butyl-3-methyl imidazolium hexafluoride phosphate ionic liquid （[bmim][-PF6 ]） or binary mixed solution with acetonitrile （MeCN） was investigated by nano-second laser photolysis tech- niques. The spectral blue shift of 3XAN＂ was observed in the neat [bmim] [PF6 ] or IL/MeCN mixture solution compared to MeCN solution. And the yield was also increased. Moreover, the energy transfer rate constant of XAN and naphthalene （NAP） was affected by the concentrations of ionic liquid. The values decreased rapidly with increasing VIL. For example, the values were 1.2X101~ tool ~ L-1 ~ s-1 in MeCN, and 1.1X108 tool ~ L-1 ~ s 1 in [bmim][PF6], respectively. The photo-induced electron transfer between XAN and N, N-dimethylaniline was also investigated by changing the concentrations of [bmim-][-PF6 ] in binary solution.