Abstract
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 3400-3800 cm -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. with other water molecules. For the last two decades ionic liquids have drawn significant attentions of the scientific and industrial community for possessing characteristics like low vapor pressure, wide solubility range, large electrochemical window, low flammability, extensive liquid range, and inertness etc., which are desirable properties in synthesizing the chemical product efficiently by emphasizing on toxicity reduction as well as waste minimization.
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