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| Synthesis and mesomorphic properties of bent-shaped molecule with low bent-angle central core and long alkylthio tail |
| Xiao Dong Li, Mao Sheng Zhan, Kai Wang |
| School of Material Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China |
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Abstract Two homologous series of bent-shaped molecules composed of low bent-angle naphthalene central core and long alkoxy tail or alkylthio tail, N (1, 7)-n-OPIMB and N (1, 7)-n-SPIMB (n=20, 22), respectively, were synthesized. The mesomorphic properties were investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and X-ray diffraction (XRD). Compared to the direct transition from the isotropic phase to the chiral B4 phase examined in N (1, 7)-n-OPIMB, N (1, 7)-n-SPIMB exhibited a rare Iso-Ncol-Colh-B4 phase sequence. The combination of the asymmetric low bent-angle 1, 7-naphathalene central core and the flexible long alkylthio tail is considered to play an important role in the formation of such a novel phase sequence.
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Received: 27 December 2010
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| Fund:This research was supported by National Natural Science Foundation of China (No.51073007).We thank Prof.Junji Watanabe in Tokyo Institute of Technology for the stay in his lab to do parts of the experiment. |
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Corresponding Authors:
Mao Sheng Zhan,E-mail address:zhanms@buaa.edu.cn
E-mail: zhanms@buaa.edu.cn
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| About author:: 10.1016/j.cclet.2011.04.008 |
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