Open AccessArticle
Laser photolysis study of anthraquinone in binary mixtures ofionic liquid [bmim][PF6] and organic solvent
by
Guanglai Zhu, Jingjing Xu, Guozhong Wu, Hongping Zhu, Dewu Long, Shimou Chen and Side Yao
Int. J. Mol. Sci. 2006, 7(12), 590-600; https://doi.org/10.3390/i7120590 (registering DOI) - 19 Dec 2006
Cited by 13 | Viewed by 7203
Abstract
Photochemical properties of the ionic liquid (RTIL) 1-butyl-3-methylimidazoliumhexafluorophosphate [bmim][PF
6] 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
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Photochemical properties of the ionic liquid (RTIL) 1-butyl-3-methylimidazoliumhexafluorophosphate [bmim][PF
6] 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][PF
6]. 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 V
RTIL = 0.2 for RTIL/MeCN and V
RTIL =0.05 for RTIL/DMF. For both systems, before the critical point, the rate constant increasesrapidly with increasing V
RTIL; however, it decreases obviously with VRTIL after the criticalpoint. We conclude that the concentration dependence is dominant at lower V
RTIL, while theviscosity and phase transformation are dominant at higher V
RTIL for the effect of ionic liquidon the decay of rate constant.
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