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http://dx.doi.org/10.5857/RCP.2015.4.3.67

Organic co-solvents mediated variation in anion-water hydrogen bonding in [Bmim][BF4] ionic liquid through FTIR spectroscopy  

Manna, Arpan (Department of Chemistry and Chemistry, Institute for Functional Materials, Pusan National University)
Lim, Manho (Department of Chemistry and Chemistry, Institute for Functional Materials, Pusan National University)
Publication Information
Rapid Communication in Photoscience / v.4, no.3, 2015 , pp. 67-69 More about this Journal
Abstract
FTIR spectroscopy has been employed to investigate the variation of anion-water hydrogen bonding in 1-butyl 3-methyl imidazolium tetrafluoroborate ([Bmim][$BF_4$]) ionic liquid caused by addition of organic co-solvents with various polarities. The variation was estimated by probing band shape and intensity of the OH stretching vibration of trace water present in ionic liquid at $3400-3800cm^{-1}$. The presence of polar aprotic co-solvent in ionic liquid dramatically reduces the absorptivity of the OH stretch band, indicating that the co-solvent changes the nature of anion-water hydrogen bond drastically, which might be responsible for the reduction of the viscosity of ionic liquid in the presence of the co-solvent.
Keywords
Ionic liquid; FTIR; Co-solvent;
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