Novel supramolecular columnar liquid crystals based on thiosemicarbazides
作者:E. Y. Elgueta、M. L. Parra、J. Barberá、J. M. Vergara、J. A. Ulloa
DOI:10.1080/10610278.2011.622390
日期:2011.11.1
Novel liquidcrystal materials based on 3,4-di-n-alkoxybenzoylthiosemicarbazides (3a–h, n = 5–10, 12, 14) were synthesised. The mesomorphic properties of these compounds were characterised and studied by differential scanning calorimetry, polarising optical microscopy and X-ray diffraction. Compound 3a did not show mesomorphic properties; 3b shows a monotropic hexagonal columnar (Colh) phase. Compounds
合成了基于 3,4-二-n-烷氧基苯甲酰氨基硫脲 (3a-h, n = 5-10, 12, 14) 的新型液晶材料。通过差示扫描量热法、偏光显微镜和 X 射线衍射对这些化合物的介晶性质进行了表征和研究。化合物3a没有表现出介晶性质;图3b显示了单向六方柱状(Colh)相。化合物 3c-h 显示出对映的 Colh 相。发现介晶性质取决于烷氧基侧链的长度。在 N,N-二甲基甲酰胺溶液中,所有化合物均显示出室温发射,λmax 为 361–332 nm。还进行了热重分析。
Synthesis and Characterization of <i>bis</i>[<i>n</i>-(4-benzoyloxy) Benzylidene{<i>n</i>(<i>n</i>-di-/tri-alkoxy)benzoyl}-hydrazinato]nickel(II) Complexes Displaying Liquid Crystalline Columnar Phases
作者:M. Nurul Abser、M. Manzurul Karim、Abu Kauser、Rabeya Parvin、M. Elias Molla、Zenifer Yeasmin、Wajdi Michel Zoghaib、Zainab Al-Rawahi、Carlo Carboni、Ghalib Al-Saidi
DOI:10.1080/15421406.2012.726008
日期:2013.1.1
A series of materials based on the aroylhydrazinatonickel (II) complex is synthesized and characterized. The molecule in the materials consist of two 4-benzoyloxy-benzene groups and two benzene rings having two or three alkoxy chains containing 6, 8, 10, and 12 carbon atoms attached at the azomethine moiety. The synthesis, characterization by NMR and the phase sequence observed by DSC and polarized light microscopy are presented. Most of the compounds in the series display columnar phases in the temperature range between 100 degrees C and 200 degrees C. The phases observed and their temperature ranges are discussed in terms of the number and position of attached alkoxy chains.
Fluorescence-Enhanced Organogels and Mesomorphic Superstructure Based on Hydrazine Derivatives
作者:Peng Zhang、Haitao Wang、Huimin Liu、Min Li
DOI:10.1021/la100325c
日期:2010.6.15
New low-molecular-mass organic gelators (LMOGs) bearing hydrazine linkage and end-capped by phenyl, namely 1,4-bis[(3,4-bisalkoxyphenyl)hydrozide]phenylene (BPH-n, n = 4, 6, 8, 10), were designed and synthesized. These organogelators have shown great ability to gel a variety of organic solvents to form stable organogels with the critical gelation concentration as low as 8.7 x 10(-4) mol L-1 (0.06 wt %). The formed gel has a high gel sol transition temperature (T-gel) at low gelation concentration. Aggregation-induced emission (AIE) has been observed after gelation though conventional chromophore units not incorporated in BPH-n. The fluorescence quantum yields of xerogel are 2 orders higher than that of dilute solution. In addition, the BPH-n (n = 6, 8, 10) exhibited thermotropic hexagonal column (Col(h)) mesophase, which are stable at room temperature as revealed by differential scanning calorimetry (DSC), polarized optical microscopy (POM), and X-ray diffraction (XRD) studies.