高荧光α-氰基二苯乙烯类配体及有机硼化合物液晶材料的合成与性质

发布时间：2018-03-10 00:38

本文选题：高荧光　切入点：氰基二苯乙烯　出处：《安徽大学》2017年硕士论文　论文类型：学位论文

【摘要】：荧光液晶材料是指在化合物液晶相区间内仍然具有优异发光性能的液晶材料,其显著特点是在浓缩态下具有高荧光和高量子产率。该特性就要求材料本身必须克服聚集诱导猝灭(ACQ)效应,即保持材料在聚集状态下的高荧光,旨在通过应用其自身发光的特性,实现液晶显示器件的高效节能。在这些液晶材料中,氰基二苯乙烯类化合物因其典型的聚集诱导发光性质、高浓度时依旧保持强荧光等特性,受到广泛的关注。本论文在充分调研国内外发光液晶材料研究工作的基础上,将具有优良液晶性能的席夫碱结构单元引入到发光性能优异的α-氰基二苯乙烯结构中,通过改变两端柔性链的长度,调节其分子长径比,设计、合成一系列液晶性能优异的α-氰基二苯乙烯衍生物,并通过引入缺电子的硼原子,对席夫碱结构进行修饰,合成一系列高荧光α-氰基二苯乙烯有机硼化合物。目标化合物的光物理性质通过紫外吸收光谱、荧光发射光谱等进行研究;其液晶性质和发光各向异性等性质,通过热重测试(TGA)、差示量热扫描测试(DSC)和偏光显微镜(POM)测试等进行研究。主要研究内容如下:1、本论文设计、合成了一系列α-氰基二苯乙烯席夫碱类化合物,并进一步制备了有机硼化合物。我们利用FT-IR、1H-NMR、13C-NMR表征手段,对合成的目标化合物进行了结构表征。2、α-氰基二苯乙烯席夫碱类化合物的光物理性质,利用紫外-可见吸收光谱、荧光发射光谱进行研究;液晶性质和发光各向异性等性质,利用热重测试、差示量热扫描测试和偏光显微镜测试等来进行研究。研究结果表明:席夫碱类化合物都具有高热稳定、宽液晶相区间,多液晶相态等特点,其液晶相区间随柔性链长度发生规律性变化:先增大后减小,且相变点逐渐降低,向室温液晶靠近。部分席夫碱化合物具有固态高荧光、膜样品偏振发光等特点。3、α-氰基二苯乙烯有机硼化合物的光物理性质研究表明:目标化合物具有高摩尔吸收系数、强的溶液和固态发光、高量子产率等特点。热重测试(TGA)、差示量热扫描测试(DSC)和偏光显微镜(POM)测试研究表明:此类有机硼化合物具有优秀的热稳定性、稳定的液晶相区间,强的荧光和高荧光量子产率等特点;大部分目标化合物都具有明显的指纹态自组装过程,且其电场响应性质优异。
[Abstract]:Fluorescent liquid crystal material is the liquid crystal material that still has excellent luminous property in the liquid crystal phase range of compound. Its remarkable characteristic is that it has high fluorescence and high quantum yield in the concentrated state, which requires the material itself to overcome the agglomeration induced quenching (ACQ) effect, that is, to maintain the high fluorescence of the material in the aggregated state. The purpose of this paper is to realize the high efficiency and energy saving of liquid crystal display devices by applying its own luminescence characteristics. Among these liquid crystal materials, cyano-stilbene compounds have the characteristic of typical aggregation induced luminescence and still maintain strong fluorescence at high concentration. Based on the research work of luminescent liquid crystal materials at home and abroad, Schiff base structure units with excellent liquid crystal properties are introduced into 伪 -cyano-stilbene structure with excellent luminescence properties. A series of 伪 -cyano-stilbene derivatives with excellent liquid crystal properties were designed and synthesized by changing the length of the flexible chains at both ends and adjusting the aspect ratio of the molecules. The structure of Schiff base was modified by introducing boron atoms lacking in electrons. A series of highly fluorescent 伪 -cyanostilbene organic boron compounds were synthesized. The photophysical properties of the target compounds were studied by UV absorption spectra and fluorescence emission spectra. A series of 伪 -cyano-stilbene Schiff bases were designed and synthesized by thermogravimetric test (TGA), differential scanning calorimetry (DSC) and polarizing microscope (POM). Organic boron compounds were further prepared. The structure of the synthesized target compounds was characterized by FT-IRN 1H-NMR13C-NMR, and the photophysical properties of the Schiff base compounds were characterized by UV-Vis absorption spectra. The properties of liquid crystal and luminescent anisotropy were studied by thermogravimetry. The results show that the Schiff base compounds have the characteristics of high thermal stability, wide liquid crystal phase range, multi-liquid crystal phase state, and so on. The liquid crystal phase range changes regularly with the length of the flexible chain. The phase transition point decreases gradually, and the phase transition point decreases gradually. Some Schiff base compounds have high fluorescence in solid state. The photophysical properties of organic boron compounds with 3, 伪 -cyano-stilbene show that the target compounds have high molar absorption coefficient, strong luminescence in solution and solid state. The thermogravimetric test (TGA), differential scanning calorimetry (DSC) and polarizing microscope (POM) have shown that these organic boron compounds have excellent thermal stability and stable liquid crystal phase range. Most of the target compounds have obvious fingerprint state self-assembly process and excellent electric field response.
【学位授予单位】：安徽大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O641.4;O753.2

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