Xiao-Lin Guan, Lanying Zhang, Zhen-Lin Zhang
May 2, 2009
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0
Influential Citations
27
Citations
Journal
Tetrahedron
Abstract
Abstract Three new liquid crystal asymmetrical styrene monomers bearing diacetylenes, naphthyl, and nitrogen-containing groups were successfully synthesized from 2-(bromoethynyl)-6-(hexyloxy)naphthalene, 4-(4-bromo-2-vinylphenyl)-2-methylbut-3-yn-2-ol, and derivatives of 4-ethynylaniline. The molecular structures of these compounds were confirmed by FTIR, 1 H NMR spectroscopy, elemental analysis, and mass spectrometry. The liquid crystalline properties of monomers were characterized by differential scanning calorimetry and polarized light microscopy. Results indicated that all the compounds exhibited the nematic phase in liquid crystal state and super high optical birefringence of 0.5–0.8. The change of terminal nitrogen-containing group affected the birefringence values in the order of –N(CH 3 ) 2 2