摘要: (E)-N-alkyl-4-(2-(4-dimethylaminophenyl)ethenyl) pyridinium bromides (hemicyanine bromides) with C14, C16 and C18 straight alkyl chains are described. The thermal behaviour of these compounds was investigated by differential scanning calorimetry (DSC) optical microscopy. textures observed in polarised light revealed that exhibit a smectic A mesophase. focal-conic fan texture observed, together regions showing homeotropic alignment. phase the compound chain can be summarized as: Cr1·99·Cr2·249·SmA·268·I (dec.). transition temperatures rather independent length chain. have strong tendency to supercool glassy structural model for mesophase is proposed. bromide anion hemicyanine replaced bulky tetrakis(β-diketonato)lanthanide(III) anion. As β-diketone, 2,4-pentanedione (acetylacetone, acac) 1,3-diphenyl-1,3-propanedione (dibenzoylmethane, DBM) chosen. None lanthanide complexes containing chromophore shows either melt directly an isotropic liquid, or decompose without melting.
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sci-hub.se 参考文章(8)
KOEN BINNEMANS, CINDY BEX, DUNCAN W. BRUCE, On the reported mesomorphism of lanthanide complexes containing the hemicyanine structural unit Liquid Crystals. ,vol. 26, pp. 771- 774 ,(1999) , 10.1080/026782999204868
G. Marowsky, L.F. Chi, D. Möbius, R. Steinhoff, Y.R. Shen, D. Dorsch, B. Rieger, Non-linear optical properties of hemicyanine monolayers and the protonation effect Chemical Physics Letters. ,vol. 147, pp. 420- 424 ,(1988) , 10.1016/0009-2614(88)85002-4
Wang Kezhi, Huang Chunhui, Xu Guangxian, Zhao Xinsheng, Xia Xiaohua, Wu Nianzu, Xu Lingge, Li Tiankai, Optical properties of Langmuir-Blodgett film of hemicyanine containing the rare earth complex anion Dy(BPMPHD)-2 Thin Solid Films. ,vol. 252, pp. 139- 144 ,(1994) , 10.1016/0040-6090(94)90786-2
S. R. Marder, J. W. Perry, Nonlinear Optical Polymers: Discovery to Market in 10 Years? Science. ,vol. 263, pp. 1706- 1707 ,(1994) , 10.1126/SCIENCE.263.5154.1706
M.S. Weaver, D.G. Lidzey, M.A. Pavier, H. Mellor, S.L. Thorpe, D.D.C. Bradley, T. Richardson, T.M. Searle, C.H. Huang, H. Lui, D. Zhou, Organic light-emitting diodes (LEDs) based on Langmuir-Blodgett films containing rare-earth complexes Synthetic Metals. ,vol. 76, pp. 91- 93 ,(1996) , 10.1016/0379-6779(95)03425-J
K.Z Wang, C.H Huang, G.X Xu, Q.F Zhou, Liquid-crystalline behaviors of lanthanide complexes containing hemicyanine Solid State Communications. ,vol. 95, pp. 223- 225 ,(1995) , 10.1016/0038-1098(95)00221-9
D. J. Zhou, C. H. Huang, K. Z. Wang, G. X. Xu, X. S. Zhao, X. M. Xie, L. G. Xu, T. K. Li, Langmuir-Blodgett film and second harmonic generation of a europium hemicyanine complex, Me2NC6H4CH=CHC5H4NC16H33+Eu(NTA)4- Langmuir. ,vol. 10, pp. 1910- 1912 ,(1994) , 10.1021/LA00018A049
F Lehmann, Synthesis of amphiphilic styrylpyridinium and styrylquinolinium hemicyanines and merocyanines Dyes and Pigments. ,vol. 29, pp. 85- 94 ,(1995) , 10.1016/0143-7208(95)00032-B