期刊
JOURNAL OF MOLECULAR LIQUIDS
卷 328, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.molliq.2021.115370
关键词
Ionic liquid crystals; Differential scanning calorimetry; Polarizing optical microscopy; Variable temperature X-ray diffraction; Smectic T phase; Ionic conductivity
资金
- NSF EPSCoR RING-TRUE III grant [0447416]
- NSF-SBIR grant [OII-0610753]
- NSF-STTR grant [IIP-0740289]
- NASA GRC contract [NNX10CD25P]
- American Chemical Society Petroleum Research Fund [59345-ND7]
- Carnegie Trust for the Universities of Scotland [RIG008586]
- Royal Society [RGS\R1\201397]
- Royal Society of Chemistry [M19-0000]
- Specac Ltd. [RGS\R1\201397]
A series of asymmetric viologen bistriflimide salts with short and long alkyl chains were synthesized by metathesis reaction, exhibiting high thermal stability and ionic conductivity, suggesting potential use as electrolytes.
A series of asymmetric viologen bistriflimide salts of both short and long alkyl chains were synthesized by the metathesis reaction of lithium triflimide salt with the respective asymmetric viologen dibromide salts in methanol. Their thermotropic liquid crystalline properties were determined by differential scanning calorimetry, polarizing optical microscopy and variable temperature X-ray diffraction techniques. These salts melt into highly-ordered smectic T phases that is, crystal-to SmT transitions (T(m)s)) at relatively low temperatures (lowest T-m at -12 degrees C) and maintain liquid crystallinity in a wide range of temperatures (8-132 degrees C), with excellent thermal stabilities up to 320 degrees C as determined by thermogravimetric analysis. These results differ with respect to the symmetric viologen bistriflimide salts. Ionic conductivity of these salts was also measured by dielectric impedance spectroscopy and found to be in the 10(-2.5) S cm(-1) range, highlighting their potential as electrolytes at room temperature. Crown Copyright (C) 2021 Published by Elsevier B.V. All rights reserved.
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