CAS Research/Education Center for Excellence in Molecular Sciences, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Angew Chem Int Ed Engl. 2021 Mar 8;60(11):5827-5832. doi: 10.1002/anie.202012474. Epub 2021 Feb 1.
In this work, photostable coassemblies from a nonphotostable fluorene oligomer (the energy donor) and a photostable oligomer (the energy acceptor) are fabricated. Long-range exciton migration over a net distance of about 370 energy-donor molecules to energy acceptors is demonstrated in such coassemblies. The fast and long energy migration allows harvesting of the excitation energy of energy donors by embedding a small number of energy acceptors for photostability enhancement. Importantly, embedding a small number of energy acceptors in coassemblies causes a negligible negative influence on the electron donation of energy donors that are desired in practical applications. The advantages of the coassemblies fabricated, that is, high photostability without disrupting the electron donation of energy donors, are well illustrated in fluorescence detection of trace explosives where prolonged working life and improved detection capacity are achieved.
在这项工作中，我们制备了一种非光稳定芴寡聚物（能量供体）和一种光稳定寡聚物（能量受体）的光稳定共组装体。在这些共组装体中，长程激子能够跨越大约 370 个能量供体分子的净距离迁移到能量受体上。这种快速和长距离的能量迁移允许通过嵌入少量的能量受体来收集能量供体的激发能量，从而提高光稳定性。重要的是，在共组装体中嵌入少量的能量受体对实际应用中所需的能量供体的电子供体没有可察觉的负面影响。在痕量爆炸物的荧光检测中，所制备的共组装体具有高稳定性而不破坏能量供体的电子供体的优点得到了很好的说明，在该应用中，共组装体实现了更长的工作寿命和更高的检测能力。
