Mesomorphic properties of the neat enantiomers of a chiral pyramidic liquid crystal

文献信息

发布日期 2009-08-20

DOI 10.1039/B908029P

影响因子 3.676

作者

Zeev Luz, Raphy Poupko, Ellen J. Wachtel, Herbert Zimmermann

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摘要

The crown form of nona-octanoyloxy tribenzocyclononatriene (C8) with C3 symmetry was prepared and separated into its enantiomers (C8A and C8B) by HPLC. Like the racemate, the neat enantiomers are also mesogenic, exhibiting two mesophases, M and Colh. Differential scanning calorimetry, X-ray diffraction, carbon-13 NMR and UV circular dichroism are used to study the structural and dynamic properties of these chiral mesophases. The high-temperature mesophase (Colh) was identified by X-ray diffraction as columnar hexagonal; this phase is thermally unstable, undergoing racemization on heating before its clearing point is reached. The low-temperature mesophase (M) is most likely also columnar, but its symmetry could not be determined. In comparison with the racemate, the chiral mesophases are less well ordered, more tightly packed and they have a lower tendency to crystallize. On the other hand they are considerably more mobile, as reflected in their NMR spectra. No helical structure has been identified in the X-ray diffraction of the mesophases.

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来源期刊

Physical Chemistry Chemical Physics

CiteScore: 5.5

自引率: 10.3%

年发文量: 3036

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