期刊
LIQUID CRYSTALS
卷 40, 期 3, 页码 396-410出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678292.2012.755222
关键词
mesomorphic property; smectic mesophase; benzimidazole derivative
资金
- National Science Foundation Committee of China [50802058]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1070]
- Natural Science Foundation of Shaanxi Province [2012JM2002]
- Key Technologies R&D Program of Shaanxi Province [2011K07-03, 2012K08-09]
- Fundamental Research Funds for the Central Universities [GK200902002, GK201002002]
Three series of 2-(4-alkoxybiphenyl-4-yl)-1H-benzimidazole derivatives (nM-x), which possessed 5-nitrobenzimidazole (nM-N series), benzimidazole (nM-H series) or 5-methylbenzimidazole (nM-M series) units at the end of the molecule, were synthesised and characterised by infrared, H-1- and C-13-nuclear magnetic resonance spectra, electrospray ionisation-mass spectrometry and elemental analysis. Their phase transition behaviour was investigated by differential scanning calorimetry, polarising optical microscopy and X-ray diffraction. All the compounds exhibited enantiotropic smectic mesophases with wide temperature domains for a carbon number in the alkoxy chain from 6 to 16, where the mesophase ranges were 14-91 degrees C and 17-99 degrees C during heating and cooling processes for the nM-N compounds, 7-25 degrees C and 8-49 degrees C for the nM-H compounds and 48-81 degrees C and 52-85 degrees C for the nM-M compounds, respectively. The effect of the length of alkoxy chain on mesomorphic properties was discussed. The nM-N and nM-M exhibited a much wider mesophase range whether during heating or cooling process than the corresponding nM-H series, especially for the longer terminal chain (n > 8), which indicated that the substituent in the benzimidazole moiety was helpful in increasing the mesophase stability.
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