Chiappe C, Margari P, Mezzetta A, Pomelli C S, Koutsoumpos S, Papamichael M, Giannios P, Moutzouris K
Dipartimento di Farmacia, Università di Pisa, via Bonanno 33, 56126 Pisa, Italy.
Laboratory of Electronic Devices and Materials, Department of Electronic Engineering, Technological Educational Institute of Athens, Athens, Greece.
Phys Chem Chem Phys. 2017 Mar 22;19(12):8201-8209. doi: 10.1039/c6cp08910k.
A systematic study on the viscosity and refractive index of 1-alkyl-3-methylimidazolium based ionic liquids (alkyl = methyl, butyl and hexyl) combined with three phosphorus containing anions, i.e. dimethylphosphate, methyl methylphosphonate and methylphosphonate, is reported. Experimental measurements account for temperature effects, while the refractive index is determined at multiple wavelengths in the visible and near infrared region. Despite the structural similarity of these anions, significant differences in the physical properties of the resulting ILs are identified, along with the clear trend of viscosity increase - and refractive index decrease - with increasing alkyl chain length on the cation. Ab initio theoretical calculations are carried out to support and rationalise the observed behaviour.
本文报道了对1-烷基-3-甲基咪唑鎓类离子液体（烷基 = 甲基、丁基和己基）与三种含磷阴离子（即磷酸二甲酯、甲基膦酸甲酯和膦酸甲酯）混合物的粘度和折射率进行的系统研究。实验测量考虑了温度影响，同时在可见光和近红外区域的多个波长下测定了折射率。尽管这些阴离子的结构相似，但所得离子液体的物理性质存在显著差异，同时随着阳离子上烷基链长度的增加，粘度增加而折射率降低的趋势明显。进行了从头算理论计算以支持并合理解释所观察到的行为。
