离子液体BMIMPF_6在DMF溶液中表观体积及相互作用

Apparent Volumes and Interaction of Mixture for BMIMPF_6+N,N-Dimethylformamide

测得常压下298．15～318．15K温度某些浓度的BMIMPF6与N，N-二甲基甲酰胺（DMF）混合液密度。计算BMIMPF6在DMF溶液表观摩尔体积，修正的Redlich—Meyer方程拟合混合液的表观摩尔体积与组分浓度关系．最大标准偏差低于0．05cm^3·mol^-1。用Redlich—Kister方程关联混合液的超额摩尔体积与组分浓度关系，推算得无限稀释偏摩尔体积和无限稀释偏摩尔超额体积。结果表明理论分析与实验结果具有较好的一致性：离子液体中离子与有机分子间存在着离子-偶极、离子对作用和结构效应诠释了体积性质的变化规律。

The density of the binary 1-butyl-3-methylimidazolium hexafluorophosphate BMIMPF6 ＋ DMF mixture was measured by some mole compositions at the temperature range from 298.15 to 318.15 K at 0.1 MPa. The measured densities were used to calculate the apparent molar volumes which were fitted to an Extended Redlich-Meyer type equation and the maximum standard deviations are lower than 0.05 cm^3·mol^-1. The Redlich-Kister polynomial was used to obtain the corresponding partial molar properties at infinite dilution and limiting excess partial molar volumes. The results indicate that the agreement between the theoretical and experimental results is satisfactory. The ion-dipole, ion-pair interactions,hydrogen bonding between ILs and DMF molecules and their structural factors is analyzed on the basis of the derived Molar volumes properties.