一种含双电荷阳离子的离子液体的蒸发研究。

Evaporation Study of an Ionic Liquid with a Double-Charged Cation.

作者信息

Chilingarov Norbert S, Zhirov Maksim S, Shmykova Anna M, Martynova Ekaterina A, Glukhov Lev M, Chernikova Elena A, Kustov Leonid M, Markov Vitaliy Yu, Ioutsi Vitaliy A, Sidorov Lev N

机构信息

Department of Chemistry , M.V. Lomonosov Moscow State University , Leninskie Gory 1/3 , Moscow 119991 , Russian Federation.

N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences , Leninsky prospect 47 , Moscow 119991 , Russian Federation.

出版信息

J Phys Chem A. 2018 May 17;122(19):4622-4627. doi: 10.1021/acs.jpca.8b02488. Epub 2018 May 7.

DOI:10.1021/acs.jpca.8b02488

PMID:29684267

Abstract

The evaporation of a dicationic ionic liquid, 1,3-bis(3-methylimidazolium-1-yl)propane bis(trifluoromethanesulfonyl)amide ([C(MIm)][TfN]), was studied by Knudsen effusion mass spectrometry. Its evaporation is accompanied by a partial thermal decomposition producing monocationic ionic liquids, 1,3-dimethylimidazolium and 1-(2-propenyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)amides, as volatile products. This decomposition does not affect the vaporization characteristics of [C(MIm)][TfN], which were established to be as follows. The vaporization enthalpy (550 K) is equal to (155.5 ± 3.2) kJ·mol; the saturated vapor pressure is described by the equation ln( p/Pa) = -(18699 ± 381)/( T/K) + (30.21 ± 0.82) in the range of 508-583 K. 1,3-Bis(3-methylimidazolium-1-yl)propane bis(trifluoromethanesulfonyl)amide is the first dicationic ionic liquid, the vaporization characteristics of which were determined with an acceptable accuracy.

摘要

采用克努森泻流质谱法研究了二价离子液体1,3-双(3-甲基咪唑-1-基)丙烷双(三氟甲磺酰)亚胺([C(MIm)][TfN])的蒸发过程。其蒸发过程伴随着部分热分解，产生单阳离子离子液体、1,3-二甲基咪唑鎓和1-(2-丙烯基)-3-甲基咪唑鎓双(三氟甲磺酰)亚胺作为挥发性产物。这种分解并不影响[C(MIm)][TfN]的汽化特性，其汽化特性如下：汽化焓(550 K)等于(155.5±3.2)kJ·mol；在508 - 583 K范围内，饱和蒸气压由方程ln(p/Pa)=-(18699±381)/(T/K)+(30.21±0.82)描述。1,3-双(3-甲基咪唑-1-基)丙烷双(三氟甲磺酰)亚胺是第一种以可接受的精度测定其汽化特性的二价离子液体。