Frequency-Domain Investigation of the Ionic Mobility of Triflate Salts in Tetrahydrofuran

详细信息    查看全文

• 作者：Tsuyoshi Yamaguchi ; Yukihiro Yamada ; Tatsuro Matsuoka ; Shinobu Koda ; Yoshiro Yasaka ; Nobuyuki Matubayasi
• 刊名：Journal of Physical Chemistry B
• 出版年：2011
• 出版时间：November 3, 2011
• 年：2011
• 卷：115
• 期：43
• 页码：12558-12565
• 全文大小：848K
• 年卷期：v.115,no.43(November 3, 2011)
• ISSN：1520-5207

文摘

The frequency-dependent molar conductivities of two triflate salts, tetrabutylammonium triflate (TBATf) and lithium triflate (LiTf), in tetrahydrofuran are measured in the microwave frequency domain at the concentrations where the direct-current molar conductivity increases with concentration. The relaxation frequency of the conductivity of TBATf increases with concentration as was demonstrated by a simulation and theoretical calculation on a simple model system. However, the low-frequency side of the relaxation of the conductivity of LiTf grows with increasing concentration, suggesting the presence of large aggregates such as triple ions. The molar conductivities of both salts at 20 GHz are about an order of magnitude smaller than those predicted by the Nernst鈥揈instein relationship, indicating the importance of the picosecond or faster dynamics in the determination of the absolute value of the conductivity.