Electrochemical studies and self diffusion coefficients in cyclic ammonium based ionic liquids with allyl substituents |
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| Authors: | Tzi-Yi Wu Shyh-Gang Su H Paul Wang Yuan-Chung Lin Shr-Tusen Gung Ming-Wei Lin I-Wen Sun |
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| Affiliation: | aDepartment of Chemistry, National Cheng Kung University, Tainan 701, Taiwan;bDepartment of Polymer Materials, Kun Shan University, Tainan 71003, Taiwan;cDepartment of Environmental Engineering, National Cheng Kung University, Tainan, Taiwan;dInstitute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung 804, Taiwan |
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| Abstract: | Several cyclic ammonium-based ionic liquids (ILs) with allyl substituent are synthesized, these allyl substituent ILs have high ionic conductivity (up to 4.72 mS cm−1 at 30 °C) and wide electrochemical window of 5 V. The electrochemical behaviors of two organometallic redox couples Fc/Fc+ (ferrocene/ferrocenium) and Cc/Cc+ (cobaltocene/cobaltocenium) have been studied in these ILs, the calculated Stokes–Einstein product (Dη T−1) of ferrocene in ILs is larger than that of cobaltocenium in ILs. The self-diffusion coefficients of cation and anion in these ILs are studied using pulsed gradient spin-echo NMR technique. There are very few reports where electrochemically derived diffusion coefficients and self diffusion coefficients are available for comparison, so a new key concept in electrochemistry could be developed in this paper. |
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| Keywords: | Ionic liquid Molten salt Conductivity Electrochemical window Electrochemically derived diffusion coefficients Self diffusion coefficients |
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