1-烷基-3-甲基咪唑硫酸氢盐系列离子液体的热力学性质

Thermodynamic Properties of a Series of Closely Related Ionic Liquids Based on 1-Alkyl-3-methylimidazolium Hydrosulfate

在293.15～343.15 K温度范围内,用MYX-1密度计测定了系列离子液体1-丁基-3-甲基咪唑硫酸氢盐[C4mim]HSO4(1-butyl-3-methylimdazolium hydrosulfate)、1-己基-3-甲基咪唑硫酸氢盐[C6mim]HSO4(1-hexyl-3-methylimdazolium hydrosulfate)、1-辛基-3-甲基咪唑硫酸氢盐[C8mim]HSO4(1-octyl-3-methylimdazo-lium hydrosulfate)和1-癸基-3-甲基咪唑硫酸氢盐[C10mim]HSO4(1-decyl-3-methylimdazolium hydrosulfate)的密度.利用不同温度下的密度值计算得出了离子液体的热膨胀系数及分子体积.利用Glasser经验方程计算了离子液体的标准熵和晶格能,并进一步对其热力学性质进行了讨论.

The densities of a series of ionic liquids HSO4（1-butyl-3-methylimdazolium hydrosulfate）,HSO4（1-hexyl-3-methylimdazolium hydrosulfate）,HSO4（1-octyl-3-methylimdazo-lium hydrosulfate） and [C10mim]HSO4（1-decyl-3-methylimdazolium hydrosulfate） were determined from 293.15 K to 343.15 K.The coefficients of thermal expansion and molecular volume of the ionic liquids were calculated from the density results.Standard entropies and lattice energy of the ionic liquids were calculated from the experimental density values using Glasser＇s equation.The thermodynamic properties of the ionic liquid were further discussed.