Citation: WANG Meng, PAN Xu, DAI Song-Yuan, CHEN Jian. Influence of Intermolecular Interactions on the Mesogenic Properties of Imidazolium Salts[J]. Acta Physico-Chimica Sinica, ;2015, 31(4): 653-659. doi: 10.3866/PKU.WHXB201502031 shu

Influence of Intermolecular Interactions on the Mesogenic Properties of Imidazolium Salts

WANG Meng ¹ ,
PAN Xu ^1, ,
DAI Song-Yuan ^1,2, ,
CHEN Jian ¹

1.
1 Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, P. R. China;
2 Beijing Key Laboratory of Novel Thin Film Solar Cell, North China Electric Power University, Beijing 102206, P. R. China

Received Date: 21 November 2014
Available Online: 3 February 2015
Fund Project: 国家重点基础研究发展规划项目(973) (2011CBA00700) (973) (2011CBA00700) 国家高技术研究发展计划项目(863) (2011AA050510) (863) (2011AA050510) 国家自然科学基金(21103197,21273242) (21103197,21273242)中国博士后科学基金(2013M540526)资助 (2013M540526)

Aseries of imidazolium salt-based ionic liquid crystals with a smectic A(SmA) phase are synthesized by altering the substituents attached to the 1-position (N1) and 3-position (N3) of the imidazolium ring, and anions. The mesogenic properties of the imidazolium salts, including mesophase temperature range and structural properties, are studied by differential scanning calorimetry, small-angle X-ray diffraction, and single crystal diffraction. The anisotropic ion conductivities of several ionic liquid crystals are also measured. It is found that substituents attached to N1 or N3 and the anions influence the van der Waals interactions and hydrogen bond, which results in a significant effect on the mesogenic properties of the imidazolium salts. Moreover, when a vinyl group is attached to the N3 position, π-π stacking interactions form between adjacent layers. This not only benefits the formation of a mesophase but also results in the biggest layer spacing and lowest anisotropic ion conductivities for imidazolium tetrafluoroborates. These results suggest that all intermolecular interactions should be taken into account when regulating the mesogenic properties of ionic liquid crystals.
- Imidazolium salts,
- Mesogenic property,
- van der Waals interaction,
- Hydrogen bond,
- π-π stacking
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