Molecular assemblies featuring two-dimensionality have attracted increasing attention, whereas such structures are difficult to construct simply relying on spontaneous molecular assembly. Here, we present two-dimensional assemblies of acene chromophores achieved using a tripodal triptycene supramolecular scaffold, which have been shown to exhibit a strong ability to assemble molecular and polymer motifs two-dimensionally. We designed pentacene and anthracene derivatives sandwiched by two triptycene units. These compounds assemble into expected two-dimensional structures, with the pentacene chromophores having both sufficient overlap to cause singlet fission and space for conformational change to facilitate the dissociation of a triplet pair into free triplets, which is not the case for the anthracene analog. Detailed spectroscopic analysis revealed that the pentacene chromophore in the assembly undergoes singlet fission with a quantum yield of 88 ± 5%, giving rise to triplet pairs, from which free triplets are efficiently generated (Φ T = 130 ± 8.8%). This demonstrates the utility of the triptycene-based scaffold to design functional π-electronic molecular assemblies.

中文翻译：

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超分子支架定向的五苯二维组装成构型，以促进单线态裂变


具有二维性的分子组装越来越受到关注，而这种结构很难仅仅依靠自发的分子组装来构建。在这里，我们提出了使用三足三苯超分子支架实现的乙烯发色团的二维组装，这已被证明表现出强大的二维组装分子和聚合物基序的能力。我们设计了由两个三苯单元夹在一起的五苯和蒽衍生物。这些化合物组装成预期的二维结构，其中五苯发色团具有足够的重叠以引起单重态裂变和构象变化的空间以促进三重态对解离为游离三重态，而蒽类似物则不是这种情况。详细的光谱分析表明，组装体中的五苯发色团发生单重态裂变，量子产率为 88 ± 5%，产生三重态对，从中可以有效地生成游离三重态 （Φ T = 130 ± 8.8%）。这证明了基于三联苯的支架在设计功能性π电子分子组装体方面的实用性。