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Citation: ZHENG Min-Yan, AN Zhong-Wei. Synthesis and Mesophase of Liquid Crystals of Multi-ring Monoesteryl Aryl Aldehyde[J]. Chinese Journal of Applied Chemistry, ;2007, 24(4): 396-400. shu

Synthesis and Mesophase of Liquid Crystals of Multi-ring Monoesteryl Aryl Aldehyde

ZHENG Min-Yan ,
AN Zhong-Wei ^,

1.
School of Chemistry & Material Science, Shaanxi Normal University, Xi'an 710062

Corresponding author: AN Zhong-Wei,
Received Date: 8 May 2006
Available Online: 26 August 2006
Fund Project: 国防科工委关键基础材料研究项目(K0900050802) (K0900050802)

With a series of carboxylic acids of double rings substituted by n-propyl,n-pentyl with p-hydroxyl benzaldehyde as reactants,four liquid crystal compounds of multi-ring monoesteryl aryl aldehydes were synthesized by the reactions of chloridating and esterifying at room temperature.They were 4-(4-(trans-4-propylcyclohexyl) benzoyloxy) benzaldehyde,4-(trans-4-(trans-4-propcyclohexyl)cyclohexacyloxy)benzaldehyde,4-(4-(trans-4-pentylcyclohexyl)cyclohexacyloxy)benzaldehyde,and 4-(4-(4-pentylphenyl)benzoyloxy)benzaldehyde.Their structures were identified by IR,MS,¹H NMR and elemental analysis.DSC measurement showed their mesophase.POM(polarizing optical microscope) revealed their obvious nematic schlieren and streak textures.The results show that chloridating of carboxylic acid at room temperature can inhibit the configuration transforming of trans-cyclohe-xane and the temperature range of phase transition for the resulting compounds is 107~156℃.
- aryl aldehyde,
- esteryl,
- liquid crystal,
- texture
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