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首页> 外文期刊>Chemistry: A European journal >Pyrene as chromophore and electrophore: Encapsulation in a rigid polyphenylene shell
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Pyrene as chromophore and electrophore: Encapsulation in a rigid polyphenylene shell

机译：as作为生色团和电泳剂：封装在刚性聚苯撑壳中

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摘要

Starting from the fourfold ethynyl-substituted chromophore 1,3,6,8-tetraethynylpyrene as core, a series of polyphenylene dendrimers was prepared in high yield by combining divergent and convergent growth methods. The fluorescence quantum yields (Q(f)> 0.92) of the encapsulated pyrene chromophore were independent of the size of the polyphenylene shell. Fluorescence quenching studies and temperature-dependent fluorescence spectroscopy were performed to investigate the site isolation of the core. They indicate that a second-generation dendrimer layer is needed to efficiently shield the encapsulated pyrene and prevent aggregate formation. Alkali-metal reduction of the encapsulated pyrene core was carried out to afford the corresponding pyrene radical anions, for which hampered electron transfer to the core was observed with increasing dendrimer generation, which is further proof of the site isolation due to the polyphenylene shell. To improve film formation and solubility of the material, solubilizing alkyl chains were introduced on the periphery of the spherical particles. Furthermore, highly transparent films obtained by a simple drop-casting method showed blue emission mainly from the unaggregated species. The materials presented herein combine high quantum efficiency, good solubility, and improved film-forming properties, which make them possible candidates for several applications in electronic devices.
机译：从四倍的乙炔基取代发色团1,3,6,8-四乙炔基py开始，通过结合发散和会聚生长方法高收率制备了一系列聚苯树枝状聚合物。封装的pyr发色团的荧光量子产率（Q（f）> 0.92）与聚苯撑壳的大小无关。进行了荧光猝灭研究和温度依赖性荧光光谱法以研究核的位点隔离。他们表明，需要第二代树状聚合物层才能有效地屏蔽封装的pyr并防止聚集体形成。进行了包封的pyr核的碱金属还原，得到了相应的pyr自由基阴离子，随着树枝状聚合物生成的增加，观察到for电子向核的转移受到阻碍，这进一步证明了由于聚苯撑壳而导致的位点隔离。为了改善膜的形成和材料的溶解性，在球形颗粒的外围引入了可溶的烷基链。此外，通过简单的滴铸法获得的高度透明的膜显示出主要来自未聚集物种的蓝色发射。本文提出的材料具有高量子效率，良好的溶解性和改进的成膜性能，这使其成为电子设备中多种应用的候选材料。

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