芘类衍生物聚集形貌和光电性能的研究

发布时间：2018-05-07 03:41

本文选题：芘类衍生物 + 分子结构　；参考：《南京邮电大学》2017年硕士论文

【摘要】：一系列具有特殊分子结构的芘类衍生物被合成,进而根据其分子结构的差异,对其聚集形貌、光电性能做了详细的对比分析,总结了材料分子结构、聚集形貌和光电性能三者之间的影响因素。研究的具体内容如下:1)合成了四种不同的芘-芴衍生物PFP1、PFP2、BP1和BP2,在PFP1和PFP2分子结构中芴核的C9位存在着非共轭的芘基团,它导致了非共轭的芘基团与芘-芴主链之间形成了π-π超共轭效应。它使两个共轭体系以非定域化的形式存在,并且它们之间可以发生电子的相互转移。由于两个电子云的非定域化作用,使得PFP1和PFP2分别与BP1和BP2相比具有较小的分子结构,从而使其表现出的相对较低相变温度。由于PFP1和PFP2电子传输途径的增多,分别相对于BP1和BP2其分子间作用力增强,从而表现出更好的无定形特性;同时电子的易传输使得PFP1和PFP2具有更好的空穴注入能力,其相应发光性能分别比BP1和BP2也更胜一筹。2)设计、合成了两种具有相似结构的化合物Py-4TrH和Py-4TrHE,两者均是以芘基团为核心、三并茚基团为支链的树枝状分子结构;实验中在两种化合物分子结构中引入的多个烷基链,有效地改善了它们在常见溶剂中的溶解性能。光谱性能测试表明它们分别为蓝光、绿光材料,荧光发射峰的位置分别在468 nm和526 nm处。且它们具有较好的热稳定性。3)采用再沉降的聚集方法,使化合物Py-4TrH、Py-4Tr HE、PYT和PYET分子分别发生自聚,进一步对其聚集形貌进行SEM测试,以及对其薄膜状态进行AFM测试。在Py-4TrHE、PYET分子结构内由于炔基的存在,使分子内空间位阻减小,导致分子中某些部分更容易发生相对的移动或转动,为分子发生自组装提供更多的结合位点,使得Py-4TrHE和PYET相对应的聚集体更为均一、有序。
[Abstract]:A series of pyrene derivatives with special molecular structure were synthesized, and then the aggregation morphology and photoelectric properties of pyrene derivatives were compared and analyzed according to the differences of their molecular structures, and the molecular structures of the materials were summarized. The influence factors of aggregation morphology and optoelectronic properties. Four different pyrene-fluorene derivatives, PFP1, PFP2, BP1 and BP22, were synthesized. In the molecular structure of PFP1 and PFP2, there are unconjugated pyrene groups in the C 9 of fluorene nucleus. It leads to the 蟺-蟺 hyperconjugation effect between the unconjugated pyrene group and the pyrene-fluorene main chain. It allows two conjugate systems to exist in the form of delocalization, and electrons can be transferred between them. Because of the delocalization of two electron clouds, the molecular structure of PFP1 and PFP2 is smaller than that of BP1 and BP2, which makes them exhibit a relatively low phase transition temperature. Because of the increase of electron transport channels of PFP1 and PFP2, the intermolecular force of BP1 and BP2 increases respectively, which shows better amorphous characteristics, and the easy transport of electrons makes PFP1 and PFP2 have better hole injection ability. The corresponding luminescent properties were also superior to those of BP1 and BP2. Two compounds Py-4TrH and Py-4TrHEE with similar structures were synthesized. Both of them were dendrimer structures with pyrene as core and trindene as branched chain. Several alkyl chains were introduced into the molecular structure of two compounds, which improved their solubility in common solvents. The results show that they are blue and green, and the fluorescence emission peaks are at 468 nm and 526 nm, respectively. And they have good thermal stability. 3) by means of the method of resettling aggregation, the compounds Py-4TrHU Py-4Tr HEPYT and PYET molecules are self-polymerized respectively, and their aggregation morphology is further tested by SEM, and the film state is tested by AFM. In the molecular structure of Py-4TrHEHE-PYET, due to the presence of alkynyl group, the intramolecular steric hindrance decreases, which leads to the relative movement or rotation of some parts of the molecule, and provides more binding sites for the self-assembly of the molecule. So that the Py-4TrHE and PYET corresponding aggregates are more uniform and orderly.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O625.15;TN304.5

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