Bandrés Isabel, Giner Beatriz, Artigas Héctor, Royo Félix M, Lafuente Carlos
Departamento de Química OrgAnica-Química Física, Facultad de Ciencias, Universidad de Zaragoza, Zaragoza, Spain.
J Phys Chem B. 2008 Mar 13;112(10):3077-84. doi: 10.1021/jp077259p. Epub 2008 Feb 14.
A comprehensive thermophysical study of isomeric room-temperature ionic liquids n-butyl-3-methyl-pyridinium tetrafluoroborate and n-butyl-4-methyl-pyridinium tetrafluoroborate has been performed. This paper reports various experimental data including density, speed of sound, refractive index, surface tension, isobaric molar heat capacity, and kinematic viscosity. From the experimental results, coefficients of thermal expansion, dynamic viscosities and molar refractions of the studied ionic liquids have been determined. Results have been analyzed paying special attention to the different features of the isomers and their structural differences. Several theories and empirical relations have been applied in order to predict physical properties of ionic liquids. A good agreement between experimental and calculated data has been found. Furthermore, a study about the versatility and application of the different relationships has been carried out finding that in general density and coefficients of thermal expansion can be estimated with relatively good accuracy.
已对同分异构体室温离子液体正丁基-3-甲基吡啶四氟硼酸盐和正丁基-4-甲基吡啶四氟硼酸盐进行了全面的热物理研究。本文报道了包括密度、声速、折射率、表面张力、等压摩尔热容和运动粘度在内的各种实验数据。根据实验结果，确定了所研究离子液体的热膨胀系数、动态粘度和摩尔折射度。对结果进行了分析，特别关注了异构体的不同特征及其结构差异。应用了几种理论和经验关系来预测离子液体的物理性质。实验数据与计算数据之间取得了良好的一致性。此外，还对不同关系的通用性和应用进行了研究，发现一般来说，密度和热膨胀系数可以以相对较高的精度进行估算。
