Study of phase behavior in a system of linear hydrogen-bonded carboxylic acid homologues

被引：7

作者：

Efremova, E. I. ^{[1
]}

Shiryaev, A. A. ^{[2
]}

Kydryashova, Z. A. ^{[1
,2
]}

Nosikova, L. A. ^{[1
,2
]}

Syrbue, S. A. ^{[3
]}

Chernyshev, V. V. ^{[2
,4
]}

机构：

[1] Lomonosov Moscow State Univ Fine Chem Technol, Dept Chem & Technol Rare & Dispersed Elements & M, Moscow, Russia

[2] Russian Acad Sci, Inst Phys Chem & Electrochem, Moscow, Russia

[3] Ivanovo State Univ, Dept Inorgan Chem, Ivanovo 153377, Russia

[4] Moscow MV Lomonosov State Univ, Dept Chem, Moscow, Russia

来源：

PHASE TRANSITIONS | 2015年 / 88卷 / 05期

关键词：

alkoxybenzoic acids; liquid crystals; phase diagram; hydrogen-bonded; LIQUID-CRYSTALS; CHAIN;

D O I：

10.1080/01411594.2014.989227

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

The system of hydrogen-bonded liquid crystals formed from binary mixtures p-n-heptyloxybenzoic (I) acid and p-n-undecloxybenzoic (II) acid has been investigated by polarizing optical microscopy, differential scanning calorimetry, X-ray diffraction, and scattering and dielectric measurements. The T-X phase diagram was obtained for this system. All mixtures show enantiotropic smectic and nematic phases. The crystalline phase represents a (alpha, beta) solid solution. At the 2:1 ratio of I to II, an intermediate phase - co-crystal gamma - is formed. The co-crystal gamma possesses a much wider mesophase range than the corresponding initial components. In contrast to mixtures based on the solid solutions having a positive anisotropy, the co-crystal shows a negative dielectric anisotropy in the mesophase.

引用

页码：503 / 512

页数：10

共 24 条

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