Synthesis and mesomorphic properties of bent-shaped molecule with low bent-angle central core and long alkylthio tail
作者:Xiao Dong Li、Mao Sheng Zhan、Kai Wang
DOI:10.1016/j.cclet.2011.04.008
日期:2011.9
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-N-col-Col(h)-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. (C) 2011 Mao Sheng Zhan. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.