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Synthesis and Liquid Crystalline Properties of 3‐Substituted Pentane‐2,4‐dione, Pyrazole and Isoxazole Derivatives
Author(s) -
Han Jie,
Guo Hui,
Wang XiaoGuang,
Pang MeiLi,
Meng JiBen
Publication year - 2007
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.200790007
Subject(s) - mesophase , isoxazole , chemistry , mesogen , pyrazole , differential scanning calorimetry , liquid crystal , crystallography , polymer chemistry , liquid crystalline , organic chemistry , polymer , phase (matter) , materials science , physics , optoelectronics , thermodynamics
Abstract The γ ‐substituted β ‐diketonate 2,4‐dioxo‐3‐pentyl 4‐[4‐( n ‐octyloxy)cinnamoyl]oxybenzoate 1 and its pyrazole and isoxazole derivatives ( 2 and 3 respectively) have been synthesized and characterized by the spectroscopic methods and elemental analysis. The mesogenic properties of these compounds have been studied by polarizing optical microscopy (POM) and differential scanning calorimetry (DSC). A monotropic nematic mesophase was observed for the β ‐diketonate 1 , in contrast, the pyrazole 2 displays an enantiotropic smectic A and isoxazole 3 exhibits an enantiotropic nematic mesophase. The relationship between the structure and liquid crystalline properties has also been discussed.