Polar Liquid Crystals Derived from Sulfonium Zwitterions of the [closo‐1‐CB11H12]– Anion
| Autor: | Serhii Pakhomov, Remigiusz Żurawiński, Damian Pociecha, Jacek Pecyna, Piotr Zagórski, Piotr Kaszynski |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Chemistry
Sulfonium 02 engineering and technology Dielectric 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Ion Inorganic Chemistry Crystallography Electric dipole moment Dipole chemistry.chemical_compound Polymorphism (materials science) Liquid crystal Computational chemistry Polar 0210 nano-technology |
| Zdroj: | European Journal of Inorganic Chemistry. 2016:2923-2931 |
| ISSN: | 1099-0682 1434-1948 |
| Popis: | A series of substituted 12-sulfonium zwitterions 1[n] and one example of a 1-sulfonium analogue 2[5]a were prepared in four steps. Derivatives 1[n] exhibit rich crystalline polymorphism and a high-temperature SmBcry phase stabilized by dipolar interactions. Solution studies in a nematic host demonstrated positive dielectric anisotropy of compounds 1[5]a–1[5]c (Δϵ ≈ +18 extrapolated from 8 mol-% solutions) resulting from a longitudinal electric dipole moment of ca. 9.5 D. The effectiveness of additives 1[5] was analyzed by using the Maier–Meier formalism and DFT methods and compared to those of more polar derivatives 3[6]a and Pyr[10]. |
| Databáze: | OpenAIRE |
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