Novel bent-shaped liquid crystalline compounds II. Synthesis and properties of the 1,3-bis4-[4-(4-alkyloxybenzoyloxy)benzylidene]aminophenoxypropan-2-ols |
| |
Authors: | Bong-keun So Yon-suk Kim Man-muk Choi Soo-min Lee Jung-eun Kim Hyun Hoon song Joo-hoon Park |
| |
Institution: |
a Department of Chemistry, Hannam University, Taejon 306-791, Korea
b Department of Polymer Science & Engineering, Hannam University, Taejon 306-791, Korea
c School of Natural Science, Hoseo University, Choongnam 336-795, Korea |
| |
Abstract: | A series of new symmetric dimer compounds was synthesized, constaining 2-hydroxy-1,3-dioxypropylene as the central linkage and terminal alkyl chains with different lengths. The chemical structures of the liquid crystal dimers (2ES-n) were examined by FTIR and 1H NMR spectroscopy. Their mesomorphism, thermodynamic properties and optical textures were investigated by differential scanning calorimetry, polarizing optical microscope and X-ray diffraction. For homologues with terminal propyloxy and butyloxy chains, no liquid crystalline phase was observed. Homologues with pentyloxy and hexyloxy terminal chains showed nematic phases, while those with heptyloxy, octyloxy, nonyloxy and decyloxy terminal chains displayed nematic phases and smectic phases. The results confirmed that the liquid crystalline phase changes from nematic to smectic as the terminal chain length increases. |
| |
Keywords: | |
本文献已被 InformaWorld 等数据库收录! |
|