| 离子液体[bmim][BF4]对联苯甲酰光化学反应影响的瞬态吸收光谱 |
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| 引用本文： | 朱光来,吴国忠,崔执凤,许新胜.离子液体[bmim][BF4]对联苯甲酰光化学反应影响的瞬态吸收光谱[J].物理化学学报,2011,27(4):971-976. |
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| 作者姓名： | 朱光来 吴国忠 崔执凤 许新胜 |
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| 作者单位： | 1. Institute of Atomic and Molecular Physics, Anhui Normal University, Wuhu 241000, Anhui Province, P. R. China;
2. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, P. R. China |
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| 基金项目： | 国家自然科学基金(20673137,20903004); 安徽高校省级自然科学研究重点项目(KJ2010A145); 安徽师范大学博士启动基金资助~~ |
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| 摘 要： | 利用纳秒级激光光解瞬态吸收光谱研究了联苯甲酰(BZ)在离子液体1-丁基-3-甲基咪唑四氟硼酸盐(bmim]BF4])与乙腈(MeCN)混合体系中的光化学反应行为. 考察了探针分子BZ存在下bmim]BF4]/MeCN比例对体系中化学反应动力学的影响. 实验发现: 在N2饱和条件下, BZ溶液经激光辐照后产生的激发三线态3BZ*遵循一级反应动力学规律衰减. 离子液体(IL)相对比例增加对3BZ*瞬态吸收峰的位置和强度没有产生明显影响. 但离子液体体积分数VIL的变化对bmim]BF4]/MeCN混合溶剂中光诱导电子转移的影响却非常显著, 总体上电子转移产生的自由基的表观生成速率常数kgr随bmim]BF4]的VIL增大而减小. 在bmim]BF4]比例足够大的情况下, 3BZ*与三乙胺或四甲基对苯二胺之间的电子转移被抑制.
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| 关 键 词： | 室温离子液体 1-丁基-3-甲基咪唑四氟硼酸盐 联苯甲酰 激光光解 光诱导电子转移 |
| 收稿时间： | 2010-11-01 |
| 修稿时间： | 2011-03-10 |
Transient Absorption Spectroscopy of the Effects of the Ionic Liquid [bmim][BF_4] on the Photochemical Reactions of Benzil |
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| ZHU Guang-Lai,WU Guo-Zhong,CUI Zhi-Feng,XU Xin-Sheng.Transient Absorption Spectroscopy of the Effects of the Ionic Liquid [bmim][BF_4] on the Photochemical Reactions of Benzil[J].Acta Physico-Chimica Sinica,2011,27(4):971-976. |
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| Authors: | ZHU Guang-Lai WU Guo-Zhong CUI Zhi-Feng XU Xin-Sheng |
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| Institution: | 1. Institute of Atomic and Molecular Physics, Anhui Normal University, Wuhu 241000, Anhui Province, P. R. China;
2. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, P. R. China |
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| Abstract: | Using benzil (BZ) as a probe molecule, the photochemical properties of the ionic liquid (IL) 1-butyl-3-methylimidazolium tetrafluoroborate (bmim]BF4]) and its binary mixed solutions with acetonitrile (MeCN) were investigated by nanosecond laser photolysis. We found that the decay of the triplet excited state of benzil (3BZ*) in a N2-saturated solution followed mono-exponential kinetics. Along with the increase in the volume fraction (VIL) of bmim]BF4] in the mixed solvents, the absorption peak of 3BZ* d... |
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| Keywords: | Room temperature ionic liquid 1-Butyl-3-methylimidazolium tetrafluoroborate Benzil Laser photolysis Photoinduced electron transfer |
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