Physicochemical Properties and Structures of Room-Temperature Ionic Liquids. 3. Variation of Cationic Structures

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  • Hiroyuki Tokuda
    Department of Chemistry and Biotechnology, Yokohama National University and CREST-JST, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan, and National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Centre 2, Tsukuba 305-8568, Japan, and National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Centre 5, Tsukuba 305-8565, Japan
  • Kunikazu Ishii
    Department of Chemistry and Biotechnology, Yokohama National University and CREST-JST, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan, and National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Centre 2, Tsukuba 305-8568, Japan, and National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Centre 5, Tsukuba 305-8565, Japan
  • Md. Abu Bin Hasan Susan
    Department of Chemistry and Biotechnology, Yokohama National University and CREST-JST, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan, and National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Centre 2, Tsukuba 305-8568, Japan, and National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Centre 5, Tsukuba 305-8565, Japan
  • Seiji Tsuzuki
    Department of Chemistry and Biotechnology, Yokohama National University and CREST-JST, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan, and National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Centre 2, Tsukuba 305-8568, Japan, and National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Centre 5, Tsukuba 305-8565, Japan
  • Kikuko Hayamizu
    Department of Chemistry and Biotechnology, Yokohama National University and CREST-JST, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan, and National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Centre 2, Tsukuba 305-8568, Japan, and National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Centre 5, Tsukuba 305-8565, Japan
  • Masayoshi Watanabe
    Department of Chemistry and Biotechnology, Yokohama National University and CREST-JST, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan, and National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Centre 2, Tsukuba 305-8568, Japan, and National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Centre 5, Tsukuba 305-8565, Japan

書誌事項

公開日
2006-01-26
DOI
  • 10.1021/jp053396f
公開者
American Chemical Society (ACS)

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説明

A series of room-temperature ionic liquids (RTILs) were prepared with different cationic structures, 1-butyl-3-methylimidazolium ([bmim]), 1-butylpyridinium ([bpy]), N-butyl-N-methylpyrrolidinium, ([bmpro]), and N-butyl-N,N,N-trimethylammonium ([(n-C(4)H(9))(CH(3))(3)N]) combined with an anion, bis(trifluoromethane sulfonyl)imide ([(CF(3)SO(2))(2)N]), and the thermal property, density, self-diffusion coefficients of the cation and anion, viscosity, and ionic conductivity were measured over a wide temperature range. The self-diffusion coefficient, viscosity, ionic conductivity, and molar conductivity follow the Vogel-Fulcher-Tamman equation for temperature dependencies, and the best-fit parameters have been estimated, together with the linear fitting parameters for the density. The relative cationic and anionic self-diffusion coefficients for the RTILs, independently determined by the pulsed-field-gradient spin-echo NMR method, appear to be influenced by the shape of the cationic structure. A definite order of the summation of the cationic and anionic diffusion coefficients for the RTILs: [bmim][(CF(3)SO(2))(2)N][bpy][(CF(3)SO(2))(2)N][bmpro][(CF(3)SO(2))(2)N][(n-C(4)H(9))(CH(3))(3)N][(CF(3)SO(2))(2)N], has been observed, which coincides with the reverse order to the viscosity data. The ratio of molar conductivity obtained from the impedance measurements to that calculated by the ionic diffusivity using the Nernst-Einstein equation quantifies the active ions contributing to ionic conduction in the diffusion components and follows the order: [bmpro][(CF(3)SO(2))(2)N][(n-C(4)H(9))(CH(3))(3)N][(CF(3)SO(2))(2)N][bpy][(CF(3)SO(2))(2)N][bmim][(CF(3)SO(2))(2)N] at 30 degrees C.

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