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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：咔唑树枝状分子包围的多功能离子杂化聚丙烯亚胺树枝状大分子：液晶，光学和电化学性质

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摘要

Two novel series of dendrimers synthesised by the ionic grafting of poly(propylene imine) PPI-(NH2)(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：通过两代双功能树突（G1COOH）离子接枝聚（丙烯亚胺）PPI-（NH2）（n）（表面上的n = 4、8、16、32、64个伯胺）合成的两个新型树状聚合物制备了由2，2-双（羟甲基）丙酸（bis-MPA）衍生的G2COOH）。树突在其顶点处含有一个羧基，在其外围含有电活性咔唑基和介晶单元。通过IR和NMR测量证实了质子从羧酸到胺基的转移。已经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）研究了液晶行为。所有离子树状聚合物均为液晶（向列，近晶或柱状中间相）。中间相的类型取决于树状体的生成以及树状体的生成。通过循环伏安法（CV）研究了离子树状聚合物的电化学行为。扫描电子显微镜（SEM）研究表明，材料在导电基底上发生了电化学沉积。已经研究了离子杂化树枝状聚合物的紫外可见吸收和发射性质。所有化合物在室温下均发光，强度与分子中咔唑单元的数量有关。

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