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Laser photolysis study of anthraquinone in binary mixtures ofionic liquid [bmim][PF6] and organic solvent
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, P.O. Box 800-204, Shanghai 201800, China
Institute of Atomic and Molecular Physics, Anhui Normal University, Wuhu 241000, P.R. China
Graduate University of Chinese Academy of Sciences, Beijing 100049, P.R. China
* Author to whom correspondence should be addressed.
Received: 14 September 2006; Accepted: 14 November 2006 / Published: 19 December 2006
Abstract: Photochemical properties of the ionic liquid (RTIL) 1-butyl-3-methylimidazoliumhexafluorophosphate [bmim][PF6] and its binary mixed solutions with organic solvent(DMF and MeCN) were investigated by laser photolysis at an excitation wavelength of 355nm, using anthraquinone (AQ) as a probe molecule. It was indicated that the triplet excitedstate of AQ (3AQ*) can abstract hydrogen from [bmim][PF6]. Moreover, along with thechange of the ratio of RTIL and organic solvent, the reaction rate constant changes regularly.Critical points were observed at volume fraction VRTIL = 0.2 for RTIL/MeCN and VRTIL =0.05 for RTIL/DMF. For both systems, before the critical point, the rate constant increasesrapidly with increasing VRTIL; however, it decreases obviously with VRTIL after the criticalpoint. We conclude that the concentration dependence is dominant at lower VRTIL, while theviscosity and phase transformation are dominant at higher VRTIL for the effect of ionic liquidon the decay of rate constant.
Keywords: 1-butyl-3-methylimidazolium hexafluorophosphate; Laser photolysis; Anthraquinone; Rate constant
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MDPI and ACS Style
Zhu, G.; Xu, J.; Wu, G.; Zhu, H.; Long, D.; Chen, S.; Yao, S. Laser photolysis study of anthraquinone in binary mixtures ofionic liquid [bmim][PF6] and organic solvent. Int. J. Mol. Sci. 2006, 7, 590-600.
Zhu G, Xu J, Wu G, Zhu H, Long D, Chen S, Yao S. Laser photolysis study of anthraquinone in binary mixtures ofionic liquid [bmim][PF6] and organic solvent. International Journal of Molecular Sciences. 2006; 7(12):590-600.
Zhu, Guanglai; Xu, Jingjing; Wu, Guozhong; Zhu, Hongping; Long, Dewu; Chen, Shimou; Yao, Side. 2006. "Laser photolysis study of anthraquinone in binary mixtures ofionic liquid [bmim][PF6] and organic solvent." Int. J. Mol. Sci. 7, no. 12: 590-600.