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Mesomorphic properties of troponoid esters and amides with cholest-5-ene-3β-carboxylic acid moiety |
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| Authors: | Gui-Xiang Sun Chiaki Kakei Etsuo Kume Toshihide Hatsui Seiji Ujiie Akira Mori |
| Institution: | a Institute for Materials Chemistry and Engineering, Kyushu University, Kasuga, Fukuoka 816-8580, Japan b Graduate School of Engineering Sciences, Kyushu University, 816-8580, Japan c Department of Applied Chemistry, Faculty of Engineering, Oita University, Oita 870-1192, Japan |
| Abstract: | Troponoid esters and amides connected with cholest-5-ene-3β-carboxylic acid have been synthesized to characterize their mesomorphic properties and to compare them with those of the corresponding benzenoids. 5-Alkoxytroponyl esters and amides with a long alkoxy group exhibited a twist grain boundary A* phase, as well as chiral nematic and smectic A* (SmA*) phases. The corresponding benzenoid esters exhibit SmA* and blue phases and the benzenoid amides only a SmA* phase. The differences between the mesomorphic properties are discussed in terms of the structural features of the core. |
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