期刊
CRYSTALS
卷 12, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/cryst12020136
关键词
supramolecular; low-melting ionic liquids; mesomorphic behavior; DFT
资金
- King Saud University, Riyadh, Saudi Arabia [RSP-2021/402]
Supramolecular, low-melting ionic liquid crystals with two rings of Schiff bases were synthesized and studied. It was found that the mesomorphic properties of the ionic liquids strongly depend on the polarity of the polar groups and the length of the alkyl groups.
Supramolecular, low-melting (near or below 0.0 degrees C) ionic liquid crystals with two rings of Schiff bases were prepared and studied. The Schiff bases were synthesized using 4-substituted aniline derivatives and 4-pyridine carbaldehyde and then mixed in equimolar amounts with linear 1-bromoalkanes of different chain lengths, namely C6, C8, and C14. The mesomorphic behavior and thermal properties of the compounds were determined by polarized optical microscopy (POM) and differential scanning calorimetry (DSC). Only the ionic liquids analogous with 1-bromotetradecane exhibit mesomorphic behavior. All, except the smectic A (SmA) monomorphic fluorine-substituted complex, show dimorphic enantiotropic mesophases, namely SmA followed by nematic (N) mesophases depending on the temperature rise. The DSC and POM results for the induced mesophases were then treated with density functional theory calculations (DFT). The results showed that both the polarity of the polar groups and the length of the alkyl groups strongly influence the mesomorphic properties of the ionic liquids.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据