离子液体型电解质在储能材料、电化学沉积等方面具有重要的研究意义.从酯基异构化的角度出发,设计合成了互为异构体的含酯基吡啶类离子液体,丁酸甲酯基吡啶六氟磷酸盐[n-C4MePy][PF6](记IL1)和异丙酸乙酯基吡啶六氟磷酸盐[i-C3 EAPy][PF6](记IL2).对离子液体(记IL)-有机溶剂体系的电导性能进行研究,在0.0005~0.01 mol·L-1浓度范围内,酯基异构化对二元体系的电导率影响相对较大.与IL2-有机溶剂体系相比,IL1-CH3OH的电导率约为IL2-CH3OH的2倍,而IL1-CH3CN和IL1-(CH3) 2NOH的电导率相对较小.同时在相同条件下,其不同溶剂体系的电导率为κ甲醇>κ乙腈>κN,N二甲基甲酰胺,这可能与溶剂的介电常数大小有关.进一步研究表明,离子液体异构体(IL)-有机溶剂体系的导电行为均符合阿伦尼乌斯行为,在N,N-二甲基甲酰胺溶剂体系中,离子液体的酯基异构使得体系的电导活化能变化较为显著.与IL1-(CH3)2NOH相比,IL2-(CH3)2NOH的电导活化能减小了8.454 kJ·mol-,这可能是由于IL2与溶剂分子上的基团相互吸引力增强,导致了其体系活化能减小.最后对离子液体异构体的热稳定性分析表明,与IL1的分解温度487.48℃相比,酯基异构化使IL2的热分解温度降低了301.77℃.
参考文献
[1] | Tae Hui Kang;Mahn Won Kim;Yoonnam Jeon.Molecular Designed Ionic Liquid Crystal in Alkane[J].The journal of physical chemistry, C. Nanomaterials and interfaces,201327(27):14332-14337. |
[2] | M. Montanino;M. Moreno;F. Alessandrini;G. B. Appetecchi;S. Passerini;Q. Zhou;W. A. Henderson.Physical and electrochemical properties of binary ionic liquid mixtures: (1-x) PYR_(14)TFSI-(x) PYR_(14)IM_(14)[J].Electrochimica Acta,2012:163-169. |
[3] | Yuanyuan Liu;Wenwen Xiao;Shuqian Xia.SO3H-funetionalized acidic ionic liquids as catalysts for the hydrolysis of cellulose[J].Carbohydrate Polymers: Scientific and Technological Aspects of Industrially Important Polysaccharides,20131(1):218-222. |
[4] | 赵宁;董文举;石起增.苯甲醛在离子液体中的电化学行为[J].电化学,2006(1):80-84. |
[5] | Wang JJ;Wang HY;Zhang SL;Zhang HH;Zhao Y.Conductivities, volumes, fluorescence, and aggregation behavior of ionic liquids [C(4)mim][BF4] and [C(n)mim]Br(n = 4, 6, 8, 10, 12) in aqueous solutions[J].The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical,200722(22):6181-6188. |
[6] | P. M. Richardson;A. M. Voice;I. M. Ward.Pulsed-Field Gradient NMR Self Diffusion and Ionic Conductivity Measurements for Liquid Electrolytes Containing LiBF_4 and Propylene Carbonate[J].Electrochimica Acta,2014:606-618. |
[7] | ZHAO Yamei;CUI Hongmeng;ZHENG Changzheng;CHEN Xiaogang;LI Chunyang.Crystal Structures, Thermal Analysis and Electrochemical Behaviors of Functionalized Pyridinium Ionic Liquids Comprising One 1-Ethyl Acetate Group[J].高等学校化学研究(英文版),2016(1):112-117. |
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