Supramolecular hydrogen-bonded liquid crystals based on 4-n-alkylthiobenzoic acids and 4,4′-bipyridine: Their mesomorphic behavior with comparative study including alkyl and alkoxy counterparts
| Autor: | Yuki Arakawa, Yukito Sasaki, Hideto Tsuji |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Phase transition Mesophase 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials 4 4'-Bipyridine Crystallography chemistry.chemical_compound Homologous series chemistry Liquid crystal Phase (matter) Materials Chemistry Alkoxy group Physical and Theoretical Chemistry 0210 nano-technology Spectroscopy Alkyl |
| Zdroj: | Journal of Molecular Liquids. 280:153-159 |
| ISSN: | 0167-7322 |
| DOI: | 10.1016/j.molliq.2019.01.119 |
| Popis: | We designed hydrogen-bonded liquid crystals (HBLCs) between a 4-n-alkylthiobenzoic acid homologous series and a 4,4-bipyridine at each ratio of 2/1 (mol/mol), and investigated their mesomorphic behavior. They show a wide range of mesophases compared with those formed in each single component of 4-n-alkylthiobenzoic acids. With increasing alkyl chains, they represent the following gradual changing for thermally additional phase sequences; from nematic phase to smectic (Sm) A (SmA) phase, then to SmC phase and further to SmI phase. In addition, their phase transition behavior was comprehensively discussed together with those for two familiar counterparts based on 4-n-alkylbenzoic acids and 4-n-alkoxybenzoic acids. It was found that the melting points are the highest for 4-n-alkoxy complexes and the trends of those for the rest depend on the alkyl chain length, whereas the isotropic points and the resultant mesophase ranges are clearly in the order of 4-n-alkoxy >4-n-alkyl >4-n-alkylthio complexes. |
| Databáze: | OpenAIRE |
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