Synthesis and smectogenic properties of novel phloroglucinol-based star-shaped liquid crystals containing three peripheral alkyloxylated Schiff base arms |
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Authors: | Yew-Hong Ooi Chun-Chieh Han Hong-Cheu Lin Kenji Kubo Masato M Ito |
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Institution: | 1. Liquid Crystal Research Laboratory , School of Chemical Sciences, Universiti Sains Malaysia , 11800 , Penang , Malaysia;2. Department of Materials Science and Engineering , National Chiao Tung University , Taiwan , Republic of China;3. Department of Environmental Engineering for Symbiosis , Soka University , Tokyo , Japan |
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Abstract: | A series of symmetrical trimeric liquid crystalline compounds of which the molecular structure with a central core of 1,3,5-benzene attached by three rod-like mesogenic Schiff base moieties via the propylene spacers and ether linkages has successfully been synthesised and characterised by infra red and nuclear magnetic resonance spectroscopic techniques. All the star-shaped compounds in this series exhibit predominantly SmC phase except the analogue possessing terminal C8H17 group. It is apparent that the members with even parity from C10H21 to C16H33 show enantiotropic SmC phase while the member with longest terminal chain of C18H37 is inclined to monotropic smectogen. The X-ray diffraction measurements reveal that the tilted smectic layer structures of the SmC phase are confirmed to have an obvious sharp peak at small angles of 2θ ~ 1.03°–1.48° with d-spacing values of 4.01–4.58 nm, which are corresponding to tilt angles of ~48° in the SmC phase. |
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Keywords: | phloroglucinol Schiff bases star-shaped liquid crystals smectic C XRD |
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