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Korean Society of Photoscience (한국광과학회)
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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)
  • Received : 2015.08.28
  • Accepted : 2015.09.07
  • Published : 2015.09.30
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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.

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References

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