Mesomorphism in binary mixtures of 4-((hexylimino)methyl)benzoic acid and 4-alkyloxybenzoic acids

被引：6
作者：
Bhagavath, Poornima [1 ]
Mahabaleshwara, S. [2 ]
机构：
[1] Manipal Univ, Manipal Inst Technol, Dept Chem, Manipal 576104, Karnataka, India
[2] Syngene Int Ltd, Biocon Pk, Bommasandra 560099, Bengaluru, India
来源：
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2017年 / 129卷 / 01期
关键词：
Schiff base; 4-Alkyloxybenzoic acids; Binary mixtures; Nematic phase; Smectic-C phases; Mesomorphic thermal ranges; BONDED LIQUID-CRYSTALS; 4-SUBSTITUTED BENZOIC-ACIDS; SMECTIC-G PHASE; 4-(4-PYRIDYLAZOPHENYL)-4-SUBSTITUTED BENZOATES; CARBON NANOTUBE; INDUCTION; COMPLEXES; MOLECULES; MESOGENS; BEHAVIOR;
D O I：
10.1007/s10973-017-6105-y
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
A new non-mesogenic Schiff-based carboxylic acid, viz. 4-((hexylimino)methyl)benzoic acid (HIMB), is synthesized and is used to prepare the binary mixtures with mesogenic 4-n-alkyloxybenzoic acids (nOBAs, where n = 3, 4, 5, 7, 8, 9 and 12) in 1:1 molar ratio. The mesomorphism in HIMB and nOBA mixtures is studied by polarizing optical microscopy and differential scanning calorimetry. The mesomorphic thermal stabilities of these mixtures are found to vary with those of the nOBAs. The results are discussed with the reported mixtures of nOBAs with other Schiff-based pyridyl moieties, which are found to exhibit new phase variants and mesomorphic thermal stabilities. The phase transition temperatures and the enthalpy changes at the phase transitions are discussed in comparison with the other similar binary mixtures. The effects of intermolecular interactions on mesomorphism are discussed.
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页码：339 / 345
页数：7
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