Department College of Chemistry, Nankai University, Tianjin, 300071, P. R. China.
Adv Mater. 2021 Apr;33(14):e2007476. doi: 10.1002/adma.202007476. Epub 2021 Mar 3.
Constructing ultralong organic phosphorescent materials possessing a high quantum yield is challenging. Herein, assemblies of purely organic supramolecular pins composed of alkyl-bridged phenylpyridinium salts and cucurbit[8]uril (CB[8]) are reported. Different from "one host with two guests" and "head-to-tail" binding, the binding formation of supramolecular pins is "one host with one guest" and "head-to-head," which overcomes electrostatic repulsion and promotes intramolecular charge transfer. The supramolecular pin 1/CB[8] displays afterglow with high phosphorescence quantum yield (99.38%) after incorporation into a rigid matrix, which is the highest yield reported to date for phosphorescent materials. Moreover, multicolor photoluminescence can be obtained by different excitation wavelengths and ratios of host to guest. Owing to the redshift of the absorption, the supramolecular pins are applied for targeted phosphorescence imaging of mitochondria. This work will provide a reasonable supramolecular strategy to achieve redshifted and efficient phosphorescence both in the solid state and in aqueous solution.
构建具有高量子产率的超长有机磷光材料具有挑战性。在此,报道了由烷基桥联苯并吡啶盐和葫芦[8]脲(CB[8])组成的纯有机超分子钉的组装体。与“一个主体两个客体”和“头到尾”结合不同,超分子钉的结合形式是“一个主体一个客体”和“头到头”,克服了静电排斥并促进了分子内电荷转移。超分子钉 1/CB[8]在掺入刚性基质后显示出高磷光量子产率(99.38%)的余晖,这是迄今为止报道的磷光材料的最高产率。此外,通过不同的激发波长和主体与客体的比例可以获得多色光致发光。由于吸收的红移,超分子钉可用于靶向线粒体的磷光成像。这项工作将为在固态和水溶液中实现红移和高效磷光提供合理的超分子策略。