厦门大学谭元植团队报道了纳米石墨烯金属层的结构、受激变换与发射增强。相关研究成果发表在2022年7月28日出版的国际知名学术期刊《德国应用化学》。

纳米石墨烯倾向于组装成由p-p相互作用稳定的堆叠柱状结构，而其他超分子结构，如棱柱和笼状结构，很少被研究。

该文中，研究人员合成了重氮纳米石墨烯，然后与配位单元组装，形成三角形金属层。在加入C60或C70后，三角形金属层转变为方形四聚体，封装一对C60或C70。形成的主客体络合物证明了从重氮纳米石墨烯外壳到C 60核的有效能量转移。由于量子产率和光吸收系数的增加，与游离C60相比，封装C60的发射强度显著增强。

该项工作证明了基于纳米石墨烯的超分子结构在柱状堆叠之外的多功能性，以及它们增强非封闭富勒烯发射的能力。

附：英文原文

Title: Nanographene Metallaprisms: Structure, Stimulated Transformation, and Emission Enhancement

Author: Ling Chai, Yang-Yang Ju, Jiang-Feng Xing, Xiao-Hui Ma, Xin-Jing Zhao, Yuan-Zhi Tan

Issue&Volume: 2022-07-28

Abstract: Nanographenes are inclined to assemble into stacked columnar structures that are stabilized by p-p interactions, whereas other supramolecular structures of nanographenes, such as prisms and cages, are rarely investigated. Herein, a diazananographene was synthesized, and then assembled with coordination unit, producing a triangular metallaprism. After adding C  60  or C  70  , the triangular metallaprism was transformed into a square tetramer, which encapsulated a pair of C  60  or C  70  . The formed host-guest complex demonstrated the efficient energy transfer from diazananographene shell to C  60  cores. The emission intensity of capsulated C  60  was enhanced remarkably, compared with free C  60  , due to an increased quantum yield and optical absorption coefficient. This work demonstrates the versatility of nanographene-based supramolecular architectures beyond columnar stacking and their ability to enhance the emission of otherwise nonemissive fullerene.

DOI: 10.1002/anie.202210268

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202210268