Journal
DALTON TRANSACTIONS
Volume 50, Issue 10, Pages 3671-3681Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1dt00211b
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Funding
- Foundation for Polish Science [TEAM/2016-3/24]
- NSF [DMR-1611250]
- NCN [OPUS 2015/17/B/ST5/02801]
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A series of liquid crystalline pyridinium and sulfonium derivatives with CH2CH2 linking group were prepared and their structures were determined by XRD. Thermal and dielectric properties of the series in a weakly polar nematic host were evaluated, showing that pyridinium zwitterions have the highest dielectric anisotropy. The effect of linking group on thermal and electrooptical properties was discussed.
A series of liquid crystalline pyridinium and sulfonium derivatives of the [closo-1-CB9H10](-) and [closo-1-CB11H12](-) anions containing the CH2CH2 linking group was prepared and their molecular and crystal structures were determined by single crystal XRD methods. Thermal and dielectric properties of the series were evaluated in a weakly polar nematic host. The highest extrapolated dielectric anisotropy, Delta epsilon, was observed for pyridinium zwitterions (up to 56.0). The dielectric data were analyzed with the Maier-Meier formalism augmented with density functional theory calculations, and the results were compared to those obtained for the analogous ester derivatives (COO linking group). The effect of the linking group on thermal and electrooptical properties is discussed.
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