Anomalous conformational change in 1-butyl-3-methylimidazolium tetrafluoroborate-D2O mixtures |
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Authors: | Hatano Naohiro Watanabe Mayuko Takekiyo Takahiro Abe Hiroshi Yoshimura Yukihiro |
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Institution: | Department of Applied Chemistry, National Defense Academy, Yokosuka, Kanagawa 239-8686, Japan. |
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Abstract: | We have investigated the effect of deuterated water on the conformational equilibrium between the gauche and trans conformers of the bmim] cation in mixtures of water and 1-butyl-3-methylimidazolium tetrafluoroborate (bmim]BF(4)]), an ionic liquid, at room temperature. A comparison of the results obtained from solutions made with H(2)O and with D(2)O highlights an anomalous conformational change in the D(2)O solution showing an extended N-shaped behavior. The gauche conformer of the bmim] cation in D(2)O increased up to x = ~50 (D(2)O mol %); however, it decreased up to higher water concentrations of x = ~85 before again increasing drastically toward x = ~100. We provide spectroscopic evidence that the anomalous conformational dynamics of the bmim] cation in D(2)O is directly related to the H/D exchange reaction of the C-H group at position 2 of the imidazolium ring. |
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