Tu Min, Reinsch Helge, Rodríguez-Hermida Sabina, Verbeke Rhea, Stassin Timothée, Egger Werner, Dickmann Marcel, Dieu Bjorn, Hofkens Johan, Vankelecom Ivo F J, Stock Norbert, Ameloot Rob
Center for Surface Chemistry and Catalysis, KU Leuven-University of Leuven, Celestijnenlaan 200F, 3000, Leuven, Belgium.
Institut für Anorganische Chemie, Christian-Albrechts-Universität Kiel, Christian-Albrechts-Platz 4, 24118, Kiel, Germany.
Angew Chem Int Ed Engl. 2019 Feb 18;58(8):2423-2427. doi: 10.1002/anie.201813996. Epub 2019 Jan 25.
Metal-organic frameworks (MOFs) enable the design of host-guest systems with specific properties. In this work, we show how the confinement of anthracene in a well-chosen MOF host leads to reversible yellow-to-purple photoswitching of the fluorescence emission. This behavior has not been observed before for anthracene, either in pure form or adsorbed in other porous hosts. The photoresponse of the host-guest system is caused by the photodimerization of anthracene, which is greatly facilitated by the pore geometry, connectivity, and volume as well as the structural flexibility of the MOF host. The photoswitching behavior was used to fabricate photopatternable and erasable surfaces that, in combination with data encryption and decryption, hold promise in product authentication and secure communication applications.
金属有机框架（MOF）能够设计出具有特定性质的主客体系统。在这项工作中，我们展示了蒽在精心选择的MOF主体中的受限作用如何导致荧光发射的可逆黄到紫的光开关现象。无论是纯形式的蒽还是吸附在其他多孔主体中的蒽，此前均未观察到这种行为。主客体系统的光响应是由蒽的光二聚作用引起的，MOF主体的孔几何形状、连通性、体积以及结构灵活性极大地促进了这一过程。这种光开关行为被用于制造可光图案化和可擦除的表面，结合数据加密和解密，在产品认证和安全通信应用中具有前景。
