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首页> 外文期刊>Chemistry: A European journal >Intramolecular excimer formation and delayed fluorescence in sterically constrained pyrene dimers
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Intramolecular excimer formation and delayed fluorescence in sterically constrained pyrene dimers

机译：空间受限pyr二聚体的分子内准分子形成和荧光延迟

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摘要

The synthesis is described for a series of five molecular dyads comprising pyrene-based terminals covalently linked through a 1,3-disubstituted phenylene spacer. The extent of through-space communication between the pyrene units is modulated by steric interactions imposed by bulky moieties attached at the 6,8-positions of each pyrene unit. For the control compound, only hydrogen atoms occupy the 6,8 positions (DP1), whereas the remaining compounds incorporate ethynylene groups terminated with either triisopropylsilyl (DP2), 1-tert-butylbenzene (DP3), 2,6-di-tert-butylbenzene (DP4) or 1-tert-butyl-3,5-dimethylbenzene (DP5) units. Each compound shows a mixture of monomer and excimer fluorescence in fluid solution at room temperature, but only monomer emission in a glassy matrix at 77 K. ne ratio of monomer to excimer fluorescence depends markedly on the molecular structure; DP1. is heavily biased in favour of the excimer and DP4 is enriched with monomer fluorescence. Photophysical properties, including laser induced and delayed fluorescence data, are reported for each compound. Delayed fluorescence occurs by both intramolecular and bimolecular steps, but these events take place on different timescales. The possibility is raised for using intramolecular triplet-triplet annihilation as a means of molecular imaging.
机译：描述了一系列的五个分子二元化合物的合成，这些分子二元化合物通过1，3-二取代的亚苯基间隔基共价连接的pyr基末端。 units单元之间的空间连通程度是由每个unit单元的6,8位上连接的庞大部分所施加的空间相互作用调节的。对于对照化合物，仅氢原子占据6,8位（DP1），而其余化合物并入以三异丙基甲硅烷基（DP2），1-叔丁基苯（DP3），2,6-二叔-丁基苯（DP4）或1-叔丁基3,5-二甲基苯（DP5）单元。每种化合物在室温下在流体溶液中均显示出单体和准分子荧光的混合物，但只有单体在77 K的玻璃状基质中发射。单体与准分子荧光的比率显着取决于分子结构。 DP1。强烈偏爱准分子，而DP4富含单体荧光。报告了每种化合物的光物理性质，包括激光诱导和延迟的荧光数据。分子内和双分子步骤都会发生荧光延迟，但是这些事件发生在不同的时间尺度上。使用分子内三重态-三重态an灭作为分子成像手段的可能性增加了。

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