Preparation and properties of electron injecting molecular hybrid materials with high thermal performance
作者:Xin Wang、Shanyi Guang、Hongyao Xu、Xinyan Su、Naibo Lin
DOI:10.1039/c1jm11142f
日期:——
A series of oxadiazole-containing molecular hybrid materials with different structures (H1–H5) are controllably prepared by a hydrosilylation method based on the octahydridosilsesquioxane (POSS, T88HH). All these resultant hybrid materials are soluble in common organic solvents, such as chloroform, toluene, tetrahydrofuran, and 1,2-dichloroethane, and possess good film-forming properties. Their structure and properties are characterized and evaluated by FTIR, 1H NMR, 29Si NMR, GPC, TGA, DSC, UV-vis, PL, CV, and elemental analysis, respectively. It is found that the hydrosilylation reaction almost proceeds quantitatively when the feed ratio (molar number of organic monomer to molar number of POSS) is less than 4, at which the resultant hybrids can be controllably prepared by varying the feed ratio. These hybrids possess high thermal stability and good electron injecting properties and an intense blue emission was observed in these hybrids. Simultaneously, it is found that the hybrids (H3–H5) with a strong π electron conjugation effect between POSS and the oxadiazole moiety show higher thermal stability, better electron injecting properties and more intense blue emission than those (H1 and H2) without a π electron conjugation effect between POSS and the oxadiazole moiety.
通过基于八氢二硅杂喹喔烷(POSS,T88HH)的水硅化方法,可控地制备出一系列不同结构(H1-H5)的含噁二唑分子杂化材料。所有这些杂化材料均可溶于氯仿、甲苯、四氢呋喃和 1,2-二氯乙烷等常见有机溶剂,并具有良好的成膜性能。傅立叶变换红外光谱、1H NMR、29Si NMR、GPC、TGA、DSC、UV-vis、PL、CV 和元素分析分别对它们的结构和性质进行了表征和评估。研究发现,当进料比(有机单体摩尔数与 POSS 摩尔数之比)小于 4 时,水硅烷化反应几乎定量进行。这些杂化物具有较高的热稳定性和良好的电子注入特性,并观察到这些杂化物发出强烈的蓝色光。同时还发现,与 POSS 和噁二唑分子之间不存在π电子共轭效应的混合物(H1 和 H2)相比,POSS 和噁二唑分子之间存在强π电子共轭效应的混合物(H3-H5)具有更高的热稳定性、更好的电子注入特性和更强烈的蓝色发射。