Synthesis and characterization of new thermotropic liquid crystals derived from 4-hydroxybenzaldehyde

• Main Authors: Lee, Siew Ling, Sie, Tiong Ha, Teck, Leong Lee, Yip, Foo Win, Guan, Yeow Yeap
• Format: Article
• Published: World Academy of Science Engineering and Technology 2011
• Subjects: QD Chemistry
• Online Access: http://eprints.utm.my/id/eprint/29418/; https://publications.waset.org/15374/synthesis-and-characterization-of-new-thermotropic-liquid-crystals-derived-from-4-hydroxybenzaldehyde

A homologous series of aromatic esters, 4-nalkanoyloxybenzylidene- 4'-bromoanilines, nABBA, consisting of two 1,4-disubstituted phenyl cores and a Schiff base central linkage was synthesized. All the members can be differed by the number of carbon atoms at terminal alkanoyloxy chain (C nH 2n-1COO-, n = 2, 6, 18). The molecular structure of nABBA was confirmed with infrared spectroscopy, nuclear magnetic resonance (NMR) spectroscopy and electron-ionization mass (EI-MS) spectrometry. Mesomorphic properties were studied using differential scanning calorimetry and polarizing optical microscopy.