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Liquid Crystalline Behaviours of the Complexes Based on 1,3,4‐Oxadiazole Derivative and Benzoic Acid
Author(s) -
Zhao Chengxiao,
Wang Haitao,
Ran Xia,
Bai Binglian,
Zhang Yan,
Li Min
Publication year - 2012
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.201100276
Subject(s) - chemistry , mesogen , liquid crystal , differential scanning calorimetry , oxadiazole , hydrogen bond , crystallography , supramolecular chemistry , benzoic acid , phase (matter) , fourier transform infrared spectroscopy , liquid crystalline , crystal structure , molecule , organic chemistry , chemical engineering , optics , physics , engineering , thermodynamics
A non‐liquid crystal compound (4‐POXD‐6) containing the 1,3,4‐oxadiazole group and pyridyl (py) group was synthesized. And a series of supramolecular mesogenic complexes were obtained by mixing 4‐POXD‐6 and 4‐alkoxybenzoic acids (C n , n =6, 8, 12). The liquid crystalline properties of 4‐POXD‐6/C n ( n =6, 8, 12) were investigated by means of differential scanning calorimetry, polarized optical microscopy, and wide‐angle X‐ray diffraction. It was found that 4‐POXD‐6/C n (6, 8) display monotropic nematic and smectic A phases, while 4‐POXD‐6/C12 exhibits a SmX phase in the heating process and a SmA phase in the cooling run. Variable‐temperature FTIR spectroscopic studies revealed hydrogen bonds existed in both crystalline and liquid crystalline phases.