Synthesis and Characterization of bis[n-(4-benzoyloxy) Benzylidene{n(n-di-/tri-alkoxy)benzoyl}-hydrazinato]nickel(II) Complexes Displaying Liquid Crystalline Columnar Phases
摘要:
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.
Synthesis and self-assembly of photoresponsive and luminescent polycatenar liquid crystals incorporating an azobenzene unit interconnecting two 1,3,4-thiadiazoles
Novel polycatenar liquid crystals containing two 1,3,4-thiadiazole rings interconnected by an azobenzene central linkage have been synthesized and investigated by polarizing microscopy, DSC, X-ray scattering, SEM, UV-vis spectroscopy and photoluminescence measurements. These compounds can self-assemble into SmC, Colhex/p6mm and CubI/Pmn liquid crystalline phases in the bulk states and form multistimuli
通过偏光显微镜,DSC,X射线散射,SEM,UV-vis光谱和光致发光测量,合成并研究了新颖的包含两个通过偶氮苯中心键相互连接的1,3,4-噻二唑环的聚对二甲苯液晶。这些化合物可以在本体状态下自组装为SmC,Col hex / p 6 mm和Cub I / Pm n液晶相,并在有机溶剂中形成多刺激响应性有机凝胶。它们在溶液,液晶态和凝胶态下具有可逆的光响应特性。它们还显示出溶液中斯托克斯位移大的荧光发射以及对Cu 2+的结合选择性在CH 3 CN–CH 2 Cl 2溶液中的一系列阳离子中。
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。
A novel anthracene-based hydrazidederivative (3,4-ENS) was designed and synthesized, and 3,4-ENS can form stable organogel in dimethyl sulfoxide (DMSO) solvent. Firstly, 3,4-ENS xerogel from DMSO exhibits mechanofluorochromic property and its maximum emission shifts from 433 nm to 484 nm upon grinding. Secondly, DMSO xerogel exhibits thermofluorochromic behavior and its maximum emission shifts from