Faculdade de Ciências daUniversidade do Porto, Departamento de Química, Centro de Investigação em Química-Linha 4, Rua do Campo Alegre, 687-4169-007 Porto, Portugal.
Phys Chem Chem Phys. 2010 Sep 28;12(36):11125-32. doi: 10.1039/c003920a. Epub 2010 Jul 29.
Differential capacity-potential curves, C(E), were obtained from electrochemical impedance spectra (12 kHz-2 Hz) for the interfaces between Hg and a series of alkyl imidazolium-based room temperature ionic liquids having the same anion, bis(trifluoromethanesulfonyl) imide: 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl) imide [EMIM][Tf(2)N], 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl) imide [BMIM][Tf(2)N], 1-hexyl-3-methylimidazolium bis(trifluoromethanesulfonyl) imide [HMIM][Tf(2)N]. The electrocapillary curves were obtained from drop time measurements and the values of the pzc were calculated. The pzc apparently becomes more negative as the imidazolium alkyl chain length increases. A small effect of the cation is seen on the C(E) curves at negative potentials. The effect of the aromatic nature of the cation is assessed by comparing 1-butyl-1-methylimidazolium bis(trifluoromethanesulfonyl) imide, with 1-butyl-3-methylpyrrolidinium bis(trifluoromethanesulfonyl) imide [BMPyr][Tf(2)N]. The effects of temperature on the capacitance, drop time electrocapillary curve and on the pzc were also obtained. The capacity was found to increase with increasing temperature in the whole range of accessible potentials.
从汞与一系列具有相同阴离子双（三氟甲烷磺酰基）酰亚胺的烷基咪唑鎓基室温离子液体之间的电化学阻抗谱（12 kHz-2 Hz）获得了差分电容-电位曲线 C(E)：1-乙基-3-甲基咪唑鎓双（三氟甲烷磺酰基）酰亚胺 [EMIM][Tf(2)N]、1-丁基-3-甲基咪唑鎓双（三氟甲烷磺酰基）酰亚胺 [BMIM][Tf(2)N]、1-己基-3-甲基咪唑鎓双（三氟甲烷磺酰基）酰亚胺 [HMIM][Tf(2)N]。通过液滴时间测量获得了电毛细曲线，并计算了 pzc 值。随着咪唑鎓烷基链长度的增加，pzc 显然变得更负。在负电位下，阳离子对 C(E)曲线的影响很小。通过比较 1-丁基-1-甲基咪唑鎓双（三氟甲烷磺酰基）酰亚胺与 1-丁基-3-甲基吡咯烷鎓双（三氟甲烷磺酰基）酰亚胺 [BMPyr][Tf(2)N]，评估了阳离子的芳构性质的影响。还获得了电容、液滴时间电毛细曲线和 pzc 随温度的变化。发现电容随温度在整个可访问电位范围内增加。
