近日，武汉理工大学夏建龙团队报道了通过碳纳米环控制生色团的组装和耦合，使单线态裂变在生色团间的距离达到16 Å。2026年2月23日，《自然-化学》杂志发表了这一成果。

单线态裂变是指光激发单线态激子通过三重态对（TT）中间态转化为两个三重态激子的过程，在提升太阳能电池效率方面具有重要潜力。发色团间距对TT态的命运起决定性作用，较大的间距有利于TT解相关。然而，由于发色团间的耦合本质上受弱范德华力调控，迄今通过分子间单线态裂变实现高效TT生成仅限于最近邻间距小于5.6 Å的发色团组装体系。

研究组通过协同调控通过空间和通过键的电荷转移相互作用来调节发色团间距。借助碳纳米环结构单元，研究组发现即使发色团间最近距离达~16 Å时，超快单线态裂变（<4 ps）仍可有效发生。这一发现表明，在探索新型单线态裂变材料时，范德华力极限不再成为分子间距设计的根本限制。

附：英文原文

Title: Controlling chromophore assembly and coupling via carbon nanohoops enables singlet fission at interchromophore distances up to 16

Author: Zhao, Jingjing, Xu, Jingwen, Peng, Shaoqian, Wang, Kangwei, Li, Nuoya, Zhou, Hao, Han, Guangchao, Yi, Yuanping, Wu, Di, Sfeir, Matthew Y., Xia, Jianlong

Issue&Volume: 2026-02-23

Abstract: Singlet fission, a process that converts a photoexcited singlet exciton into two triplet excitons via a triplet pair (TT) intermediate state, holds important potential for enhancing the efficiency of solar cells. The interchromophore distance plays a critical role in dictating the fate of TT states, with larger separations being favourable for TT decorrelation. However, efficient TT generation through intermolecular singlet fission has thus far been limited to chromophore assemblies with nearest-neighbour distances below 5.6 because interchromophore coupling is inherently governed by weak van der Waals forces. Here we modulate interchromophore distances by simultaneously engineering through-space and through-bond charge-transfer interactions. Utilizing this strategy with the carbon nanohoop motif, we demonstrate that ultrafast singlet fission (<4ps) remains active even when the distance between chromophores is ～16 at its shortest point. This finding underscores that the van der Waals limit is no longer a fundamental design constraint in the search for new singlet fission materials.

DOI: 10.1038/s41557-026-02076-y

Source: https://www.nature.com/articles/s41557-026-02076-y