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Synthesis of Schiff Base‐type Liquid Crystalline Crown Ethers Containing Dibenzo‐18‐Crown‐6 Unit
Author(s) -
Zhang ShuYuan,
He KeKe,
Zheng ShiJun,
Tang SiFu,
Zhang XiaoJing,
Li ZiFa
Publication year - 2004
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20040220415
Subject(s) - chemistry , schiff base , differential scanning calorimetry , benzaldehyde , elemental analysis , crown (dentistry) , polymer chemistry , base (topology) , spectroscopy , organic chemistry , catalysis , medicine , mathematical analysis , physics , mathematics , dentistry , thermodynamics , quantum mechanics
The synthesis and characterization of novel Schiff base liquid crystalline crown ethers prepared from the intermediates 4‐(4′‐alkoxylbiphenyl‐4‐carbonyl) benzaldehyde, cis‐ and trans ‐4,4′‐diaminodibenzo‐18‐crown‐6 are described. The structure of these compounds have been well characterized by elemental analysis, IR, 1 H NMR and MS spectroscopy. The liquid‐crystalline behavior of these compounds was also investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) with a heating stage and polarimetric analysis.