CONFORMATIONAL CHANGE IN MESOGENIC CORES OF DISCOTIC LIQUID CRYSTALS

作     者：Xiao Zhen YANG*, Qun LU, Ye CHAI and Shan Nong ZHU Polymer Physics Laboratory and Fu Zhou WU, Rong Ben ZHANG and Ying Yan JIANG Functional Polymer Laboratory Institute of Chemistry, Academia Sinica, Beijing 100080 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：1992年第3卷第2期

页      面：123-126页

核心收录：

学科分类：07[理学] 0703[理学-化学] 

主　　题：mode flexible CONFORMATIONAL CHANGE IN MESOGENIC CORES OF DISCOTIC LIQUID CRYSTALS 

摘      要：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.