Citation: Xiao Zhen YANG, Qun LU, Ye CHAI, Shan Nong ZHU, Fu Zhou WU, Rong Ben ZHANG, Ying Yan JIANG. CONFORMATIONAL CHANGE IN MESOGENIC CORES OF DISCOTIC LIQUID CRYSTALS[J]. Chinese Chemical Letters, ;1992, 3(2): 123-126. shu

CONFORMATIONAL CHANGE IN MESOGENIC CORES OF DISCOTIC LIQUID CRYSTALS

a Polymer Physics Laboratory, Institute of Chemistry, Academia Sinica, Beijing 100080;
b Functional Polymer Laboratory Institute of Chemistry, Academia Sinica, Beijing 100080

Received Date: 4 October 1991

Fund Project: This work has been supported by a grant from the director of Institute of Chemistry, Academia Sinica, and a grant from Polymer Physics Laboratory, Academia Sinica, No.89-B-25.

Infrared spectra of bis (β-diketonato) copper (Ⅱ) complex liquid crystals with different flexible chain lengths (the carbon number=12 and 14) have been studied as a function of temperature. Conformational changes in mesogenic cores of the molecules have been characterized by using the out-of-plane bending vibration mode of aromatic C-H bonds. The result shows that for the phenylene rings and the chelate rings of the molecules there occurred an enhancement of extended conjugation of the two π-electron systems during phase transitions, which was also supported by UV measurements. It suggests that the big quasi-planar core structure in the discotic complex consisted of four phenylene rings and the central chelate rings is not maintained in every phase.
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