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首页> 外文期刊>RSC Advances >Multifunctional ionic hybrid poly(propyleneimine) dendrimers surrounded by carbazole dendrons: liquid crystals, optical and electrochemical properties
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Multifunctional ionic hybrid poly(propyleneimine) dendrimers surrounded by carbazole dendrons: liquid crystals, optical and electrochemical properties

机译：多官能离子杂交聚（加碘菊）树枝状细胞包围的树枝状大分子：液晶，光学和电化学性能

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摘要

Two novel series of dendrimers synthesised by the ionic grafting of poly(propylene imine) PPI-(NH _(2) ) _( n ) ( n = 4, 8, 16, 32, 64 primary amines on the surface) with bifunctional dendrons of two generations (G1COOH, G2COOH) derived from 2,2-bis(hydroxymethyl)propanoic acid (bis-MPA) were prepared. The dendrons contain a carboxyl group at their apex and electroactive carbazole groups and mesogenic units on their periphery. The occurrence of proton transfer from the carboxylic acid to the amine groups was confirmed by IR and NMR measurements. The liquid crystalline behavior has been investigated by means of differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and X-ray diffractometry (XRD). All ionic dendrimers were liquid crystalline (nematic, smectic or columnar mesophases). The type of mesophase depends on the dendrimer generation as well as on the dendron generation. The electrochemical behavior of the ionic dendrimers was investigated by cyclic voltammetry (CV). Scanning electron microscopy (SEM) studies revealed that electrochemical deposition of the material on the conducting substrate takes place. The UV-vis absorption and emission properties of the ionic hybrid dendrimers have been investigated. All the compounds are luminescent at room temperature and the intensity is related to the number of carbazole units present in the molecule.
机译：两种新型一系列由聚（丙烯亚胺）PPI-（NH _（2））PPI-（NH _（2））（N = 4,8,16,32,34，表面上）的离子接枝合成的一系列树枝状晶片（NH _（2））（表面上的初级胺），具有双官能的树枝状体制备来自2,2-双（羟甲基）丙酸（双-MPa）的两代（G1COOH，G2COOH）。树枝状细分含有在它们的顶点和电活性咔唑基团的羧基和周边的介性单元。通过IR和NMR测量证实了从羧酸到胺基的质子转移的发生。通过差示扫描量热法（DSC），偏振光学显微镜（POM）和X射线衍射法（XRD）研究了液晶作业。所有离子树枝状大分子均为液晶（向透明，近晶或柱状蛋白酶）。中间相的类型取决于树突生成以及Dendron生成。通过循环伏安法（CV）研究了离子树枝状面器的电化学行为。扫描电子显微镜（SEM）研究表明，在导电底物上进行材料的电化学沉积。研究了离子杂化树枝状过敏仪的UV-Vis吸收和排放性能。所有化合物在室温下发光，并且强度与分子中存在的咔唑单元的数量有关。

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