过渡金属离子液体的热化学性质研究——BMIC/ZnCl_2体系  

Studies on Thermochemical Properties of Ionic Liquid Based on Transition Metal Ions——System BMIC/ZnCl_2

作　　者：杨家振[1] 李吉广[1] 房大维[2] 张庆国[2] 冯荣凯[1] 陶闯[1] 

机构地区：[1]辽宁大学化学学院,沈阳110036 [2]中国科学院青海盐湖研究所

出　　处：《高等学校化学学报》2007年第3期492-495,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20473036)资助

摘　　要：在干燥的氩气氛中,于363K下缓慢混合等摩尔的氯化1-甲基-3-丁基咪唑(BMIC)和高纯无水ZnCl2,得到了无色透明的离子液体BMIC/ZnCl2.在298.15K下,用具有恒温环境的溶解反应热量计测定了不同浓度离子液体BMIC/ZnCl2在水中的溶解焓,依据Pitzer方程拟合得到它们的标准摩尔溶解焓ΔsHm0和Pitzer溶解焓参数.利用标准摩尔溶解焓估算了离子液体的水化焓.A colorless and transparent ionic liquid BMIC/ZnCl2 was prepared by mixing 1-butyl 3-methylimidazolium chloride（BMIC） and ZnCl2 with a molar ratio of 1：1 at 363.15 K under stirring in a glove box filled with dry argon. The molar dissolution enthalpies, A,Hm, of BMIC/ZnCl2 in water with various molalities were determined by a solution-reaction isoperibol calorimeter at 298. 15 K. In terms of Pitzer electrolyte solution theory, the molar solution enthalpy of BMIC/ZnCl2 at infinite dilution, △8Hm^0, and Pitzer parameters：βMX^（0）L βMX^（1）L and CMX^ФL were obtained respectively. According to Lecocq＇s viewpoint, ionic liquid BMIC/ZnCl2 with a MX molar ratio of 1 ： 1 is a single compound BMIZnCl3. In terms of Glasser＇s theory and thermodynamic cycle, the standard molar hydration enthalpy of ionic hquid BMIZnCl3, （ △H＋^0 ＋ △H-^0 ） = - 497 kJ/mol, was calculated. The standard molar enthalpies of hydration of individual ions can be obtained from those of electrolytes, provided that the value of one ion is known. The standard molar enthalpies of hydration of cation BMI^＋ were estimated △H＋^0 （ BMI^＋ ） = - 225 kJ/mol in literature so that the standard molar enthalpies of hydration of ZnCl3^- was obtained, that is, △H-^0 （ZnCl3^-） = - 272 kJ/mol.

关 键 词：恒温环境热量计 溶解焓 PITZER方程 离子液体 水化焓 

分 类 号：O642[理学—物理化学]