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Laser Flash Photolysis Mechanism of Anthraquinone-2-Sodium Sulfonate in Pyridine Ionic Liquid/Water Mixed System
Guang-lai Zhu1, Liang-wei Zhang1, Yan-cheng Liu2, Zhi-feng Cui1, Xin-sheng Xu1, Guo-zhong Wu2
1.Institute of Atomic and Molecular Physics, Anhui Normal University, Wuhu 241000, China;2.Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
Abstract:
The photochemical reaction process of anthraquinone-2-sodium sulfonate (AQS) in the mixture of water (H2O) and N-butylpyridinium tetrafluoroborate ([BPy][BF4]) was studied using the laser flash photolysis technique. Experimental results show that the excited triplet of AQS (3AQS*) could react rapidly with H2O and the transient absorption spectra greatly changed by increasing the volume fraction of the ionic liquid (VIL) in [BPy][BF4]/H2O mixtures. The absorbance at 510 nm increased gradually with increasing VIL when 0< VIL< 0.1. By contrast, the absorbance decreased gradually when VIL>0.1. Otherwise, the absorbance of the band near 380 nm steadily increased. The apparent kinetic parameters of transient species B and 3AQS* are obtained approximately. 3AQS* abstracting hydrogen from [BPy]+ was also explored. It was deduced that the 350-420 nm band was the superposition of the peaks of 3AQS* and AQSH·. The two reactions of 3AQS* with [BPy][BF4] and H2O are a pair of competitive reactions. We also concluded that the entire reaction processes slow down in the case of high [BPy][BF4] concentrations.
Key words:  Laser flash photolysis  Anthraquinone-2-sodium sulfonate  Ionic liquids  Transient absorption  Hydrogen abstraction
FundProject:
吡啶离子液体与水混合体系中蒽醌-2-磺酸钠的激光闪光光解机理
朱光来1, 张良伟1, 刘艳成2, 崔执凤1, 许新胜1, 吴国忠2
1.安徽师范大学原子与分子物理研究所, 芜湖 241000;2.中国科学院上海应用物理研究所, 上海 201800
摘要:
利用激光闪光光解技术研究了蒽醌-2-磺酸钠(AQS)在吡啶离子液体N-丁基吡啶四氟硼酸盐([BPy][BF4])与水(H2O)混合体系中的光化学反应过程. 实验结果表明,AQS的激发三重态(3AQS*) 会与H2O快速反应,不断增加[BPy][BF4]在混合体系中的体积比(VIL),瞬态吸收光谱发生了很大变化. 510 nm附近的瞬态吸收带变化最大,在0< VIL< 0.1时,吸光度会随着[BPy][BF4]的增加而增加;而在VIL>0.1时,吸光度则随着比例的增加而减小. 然而380 nm附近吸收带的吸光度却一直在增加. 通过拟合近似地得到了瞬态物种B和3AQS*的表观动力学参数. 另外还讨论了3AQS* 与阳离子之间的夺氢反应,通过对350~420 nm处光谱图的分析,推断出这一范围的瞬态吸收光谱是3AQS*与AQSH·的叠加谱. 在混合体系中,3AQS*分别与H2O和[BPy][BF4]的反应是一对竞争反应. 还发现在高浓度的离子液体环境下,体系的整体反应速率会减弱.
关键词:  激光闪光光解  蒽醌-2-磺酸钠  离子液体  瞬态吸收  夺氢
DOI:10.1063/1674-0068/29/cjcp1509192
分类号: