Enthalpy of solution of 1-octyl-3-methylimidazolium tetrafluoroborate in water and in aqueous sodium fluoride
Enthalpy of solution of 1-octyl-3-methylimidazolium tetrafluoroborate in water and in aqueous sodium fluoride
复制标题
DOI：
10.1021/je050136i
复制
发表时间：
2005-07-01
期刊：
影响因子：
--
通讯作者：
Magee, JW
中科院分区：
文献类型：
--
作者：
Archer, DG;Widegren, JA;Magee, JW
用绝热量热计测定了1-辛基-3-甲基咪唑四氟硼酸盐（0.0035摩尔（.））kg（-1）至0.02 mol（.）kg（-1））和不同离子强度的氟化钠水溶液（0.1mol（.）kg（-1）至0.43 mol（.）kg（-1））。对1-丁基-3-甲基咪唑四氟硼酸盐（0.013mol（.）kg（-1））的水在298 K也报道。本研究结果导致的标准状态下的溶解过程中的焓和热容的变化。的亚甲基基团的这些离子液体的溶解焓的贡献，从测量确定，并示出与从其他类别的有机化合物获得的值一致。利用亚甲基的溶解焓增量计算了1-烷基-3-甲基咪唑四氟硼酸盐系列的溶解焓。还给出了水溶液过程和水溶液溶质的标准状态热容的计算值。研究了1-辛基-3-甲基咪唑四氟硼酸盐在水中形成胶束的可能性。
An adiabatic calorimeter was used to measure the enthalpy of solution of 1-octyl-3-methylimidazolium tetrafluoroborate (0.0035 mol(.)kg(-1) to 0.02 mol(.)kg(-1)) in water and in aqueous sodium fluoride of different ionic strengths (0.1 mol(.)kg(-1) to 0.43 mol(.)kg(-1)) at nominal temperatures of 298 K, 306 K, and 313 K. Two additional measurements of the enthalpy of solution of 1-butyl-3-methylimidazolium tetrafluoroborate (0.013 mol(.)kg(-1)) in water at 298 K are also reported. The present results lead to the standard-state changes of enthalpy and heat capacity for the solution process. The contribution of a methylene group to the enthalpy of solution of these ionic liquids was determined from the measurements and is shown to be in agreement with the value obtained from other classes of organic compounds. The enthalpy of solution increment for the methylene group is used to calculate the enthalpy of solution of the series of 1-alkyl-3-methylimidazolium tetrafluoroborates. Calculated standard-state heat capacity values for the aqueous solution process and the aqueous solute are also given. Potential micelle formation of 1-octyl-3-methylimidazolium tetrafluoroborate in water was examined.