Synthesis and mesomorphic studies on the series of 2-(4-alkoxyphenyl)-5-phenylpyridines and 2-(6-alkoxynaphthalen-2-yl)-5-phenylpyridines
| Autor: | Chih-Hsun Lin, Win-Long Chia, Ci-Lin Li |
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| Rok vydání: | 2009 |
| Předmět: |
Materials science
Series (mathematics) General Chemistry Condensed Matter Physics Thermotropic crystal Hard core law.invention Crystallography Homologous series chemistry.chemical_compound Differential scanning calorimetry chemistry Optical microscope Liquid crystal law Organic chemistry General Materials Science Thermal analysis |
| Zdroj: | Liquid Crystals. 37:23-30 |
| ISSN: | 1366-5855 0267-8292 |
| DOI: | 10.1080/02678290903359275 |
| Popis: | Two homologous series of pyridine-containing liquid crystalline compounds, 2-(4-alkoxyphenyl)-5-phenylpyridines (nO-PPyP, n = 3–7) and 2-(6-alkoxynaphthalen-2-yl)-5-phenylpyridines (mO-NpPyP, m = 3–7), were synthesised. The preparation of compounds of nO-PPyP and mO-NpPyP was completed in a short two-step reaction with overall yields of about 71–80% and 36–40%, respectively. Spectral analyses were in accordance with the expected structures. Their thermotropic behaviours were studied using polarising optical microscopy (POM) and further confirmed by differential scanning calorimetry (DSC). Experimental evidence shows that compounds in the mO-NpPyP series with a slightly tilted hard core display greater nematic tendency than those in the nO-PPyP series with a straight hard core. |
| Databáze: | OpenAIRE |
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