摘要
在差示扫描量热仪(DSC)和偏光显微镜(POM)的辅助下,采用变温红外光谱对所制备的基于4,4′-联吡啶(BPy)和4-丙基苯甲酸(PBA)、4-丙基反式环己基甲酸(PCA)的氢键超分子复合物PBA-BPy和PCA-BPy中的氢键的热稳定性进行了研究。结果表明,超分子PBA-BPy中的氢键非常稳定,甚至在温度高于它的清亮点时氢键也不分解;而对于PCA-BPy,情况则完全不同,当温度稍高于它的熔点时,其分子中的氢键就被破坏。这一结果解释了为什么在结构类似的情况下PBA-BPy具有近晶相和向列相行为而PCA-BPy不具有任何中间相特征。
The hydrogen-bonded complexes based on 4＇, 4-bipyridine and carboxylic acids （4-propylbenzoic acid and trans-4-propylcyclohexyl carboxylic acid） assigned as PBA-BPy and PCA-BPy were prepared. Temperature-dependant FTIR was used to study the thermal stability of the complexes at the aid of DSC and polarized optical microscopy （POM）. The temperature-dependant FTIR studies revealed that the hydrogen boding in complex PBA-BPy was very stable and wouldn＇t decompose until the temperature was higher than its clearing point; while for PCA-BPy, the hydrogen bonding decomposed at a temperature just above its melting point. That is why PBA-BPy exhibited both smectic and nematic phase while PCA-BPy showed no mesomorphic properties though with the similar structure.
出处
《液晶与显示》
CAS
CSCD
北大核心
2009年第2期163-167,共5页
Chinese Journal of Liquid Crystals and Displays
关键词
氢键
液晶复合物
变温红外光谱
hydrogen bond
liquid crystal complex
temperature-dependant FTIR
