It is a long-standing scientific controversy to achieve anti-Kasha-type multiple emissions by tuning the structures at a molecular level. Although it is known that some conjugated structures have excitation-dependent multiple emissions, no all-benzenoid molecules have yet been reported, the emissions of which originate from different excited states. Herein, we report the design of two symmetry-breaking heterogeneous carbon bisnanohoops that in solution become multiple fluorescent emitters with unusual anti-Kasha characteristics. This phenomenon can be spectroscopically and theoretically explained and will find applications in a wide range of sensing and imaging technologies.

通过在分子水平上调整结构来实现反Kasha型多重发射是一个长期存在的科学争议。尽管已知一些共轭结构具有激发依赖性多重发射，但尚未报道来自不同激发态的发射的全苯型分子。在此，我们报告了两种打破对称性的异质碳双纳米环的设计，它们在溶液中成为具有不寻常的抗 Kasha 特性的多种荧光发射器。这种现象可以从光谱和理论上进行解释，并将在广泛的传感和成像技术中得到应用。