Influence of Anion Structure on Transport Properties of Perfluorosulfonylamide Ionic Liquids

摘要

We studied transport properties, i.e., viscosity (η), conductivity (σ), and cation and anion self-diffusion coefficients (D{sub}(cation), D{sub}(anion)), for C{sub}2mim-ILs, N{sub}122.102-ILS, and N{sub}1224-ILS, where C{sub}2mim{sup}+ is 1-ethyl-3-methylimidazolium, (N{sub}122.102){sup}+ is N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium, and (N{sub}1224){sup}+ is N-butyl-N,N-diethyl-N-methylammonium, composed of perfluorosulfonylamide anions. Ten perfluorosulfonylamide anions, i.e., C{sub}0C{sub}0 (FSA, FSI), C{sub}0C{sub}1 (FTA), C{sub}1C{sub}1 (TFSA, TFSI), C{sub}1C{sub}2, C{sub}2C{sub}2 (BETA, BETI), C{sub}1C{sub}4, C{sub}4C{sub}4, CTFSA, C{sub}3FSA, and TSAC, were used in this work. Walden product (∧{sub}(imp)η) and "ionicity" quantity (∧{sub}(imp)/∧{sub}(NMP)) were determined from the transport property data. It became apparent that there was high correlation between the ∧{sub}(imp)η and the ∧{sub}(imp)/∧{sub}(NMP) for the ILs. The results of the ∧{sub}(imp)η and the ∧{sub}(imp)/∧{sub}(NMP) indicated that by comparison with the N{sub}122.102-ILs and the N{sub}1224-ILs the ion dissociation of the C{sub}2mim-ILs was large and hardly changed with the amide anion structures.