New fluorinated azo/schiff base liquid crystals: synthesis, characterisation, mesomorphic study and DFT calculations

材料科学 偶氮苯 席夫碱 液晶 质子核磁共振 碳-13核磁共振 中胚层 结晶学 热稳定性 密度泛函理论 侧链 液晶 有机化学 差示扫描量热法 高分子化学 计算化学 化学 聚合物 热力学 物理 复合材料 光电子学
作者
Kanubhai D. Katariya,Kiran J. Nakum,Mohamed Hagar
出处
期刊:Liquid Crystals [Taylor & Francis]
卷期号:49 (3): 312-326 被引量:26
标识
DOI:10.1080/02678292.2021.1963493
摘要

A homologues series of 12 new asymmetric fluorinated azobenzene-Schiff Bases, 2-((E)-(3-chloro-4-fluorophenyl)diazenyl)-5-(((E)-arylidene) amino) anilines (Aa-l) of three rings consist of different alkyloxy groups varying carbon chain length n = 2 to n = 18 at one end and the other end of the compounds is linked to polar atoms like chlorine and fluorine on an aromatic ring at position 3 and 4 respectively were synthesised. The proposed structures of all new mesogens (Aa-l) were confirmed by FT-IR, 1H-NMR, 13C-NMR, 19F NMR and elemental analysis. The mesomorphic behaviour, optical properties and thermal stability of all new compounds have been investigated by polarised optical microscopy (POM), differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). Characteristic textures of smectic A phase were observed for all new mesogenic compounds. The photo-isomerisation property of azo compounds under UV light was also studied. Further, density functional theory (DFT) calculations were carried out to investigate thermal and geometrical parameters of all newly prepared mesogens. Moreover, the relationship between the calculated and experimentally measured parameters has been correlated to understand the effect of the structural parameters on the mesomorphic behaviour.
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