Citation: ZHU Guang-Lai, WU Guo-Zhong, CUI Zhi-Feng, XU Xin-Sheng. Transient Absorption Spectroscopy of the Effects of the Ionic Liquid [bmim][BF₄] on the Photochemical Reactions of Benzil[J]. Acta Physico-Chimica Sinica, ;2011, 27(04): 971-976. doi: 10.3866/PKU.WHXB20110421 shu

Transient Absorption Spectroscopy of the Effects of the Ionic Liquid [bmim][BF₄] on the Photochemical Reactions of Benzil

1.
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

Received Date: 1 November 2010
Available Online: 10 March 2011
Fund Project: 国家自然科学基金(20673137, 20903004) (20673137, 20903004) 安徽高校省级自然科学研究重点项目(KJ2010A145) (KJ2010A145)

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 (V_IL) of [bmim][BF₄] in the mixed solvents, the absorption peak of ³BZ^* did not change. However, the effect of different V_IL values on the photoinduced electron transfer process in the mixture of [bmim][BF₄]/MeCN was obvious. Moreover, the apparent rate constant (k_gr) of the formed radical decreased obviously with an increase in V_IL. When the ratio of [bmim][BF₄] was sufficiently high, the electron transfer reaction between ³BZ^* and triethylamine or N,N,N′,N′-tetramethyl-p-phenylenediamine was retarded.
- Room temperature ionic liquid,
- 1-Butyl-3-methylimidazolium tetrafluoroborate,
- Benzil,
- Laser photolysis,
- Photoinduced electron transfer
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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Transient Absorption Spectroscopy of the Effects of the Ionic Liquid [bmim][BF4] on the Photochemical Reactions of Benzil

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通讯作者: 陈斌, bchen63@163.com

Transient Absorption Spectroscopy of the Effects of the Ionic Liquid [bmim][BF₄] on the Photochemical Reactions of Benzil