Temperature-Dependant FTIR Investigation on Mesomorphic Properties of Hydrogen-Bonded Complexes

WEI Qiang; LIU Kai; MIAO Zhi-chao; YANG Huai

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Temperature-Dependant FTIR Investigation on Mesomorphic Properties of Hydrogen-Bonded Complexes

Material Physics & Chemistry | 更新时间：2020-08-12

- Temperature-Dependant FTIR Investigation on Mesomorphic Properties of Hydrogen-Bonded Complexes
- Chinese Journal of Liquid Crystals and Displays Vol. 24, Issue 2, Pages: 163-167(2009)
- 作者机构：
  
  1. 北京科技大学材料科学与工程学院,北京 100083, E-mail: weiqiang_1978@163.com
  2. 中海油能源发展股份有限公司采油技术服务公司油田化学分公司深圳,518067
- 作者简介：
- 基金信息：
- DOI：
  CLC： O753+.2;TN141.9
- Received：31 August 2008，
  
  Revised：02 January 1900，
  
  Published Online：30 April 2009，
  
  Published：30 April 2009
- 稿件说明：
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魏强;刘凯;苗志超;杨槐. 氢键复合物中间相行为的变温红外光谱研究[J]. 液晶与显示, 2009,24(2): 163-167

WEI Qiang;LIU Kai;MIAO Zhi-chao;YANG Huai. Temperature-Dependant FTIR Investigation on Mesomorphic Properties of Hydrogen-Bonded Complexes[J]. 液晶与显示, 2009,24(2): 163-167
魏强;刘凯;苗志超;杨槐. 氢键复合物中间相行为的变温红外光谱研究[J]. 液晶与显示, 2009,24(2): 163-167 DOI：

WEI Qiang;LIU Kai;MIAO Zhi-chao;YANG Huai. Temperature-Dependant FTIR Investigation on Mesomorphic Properties of Hydrogen-Bonded Complexes[J]. 液晶与显示, 2009,24(2): 163-167 DOI：

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。

Abstract

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.

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references

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