Second‐Sphere Interaction Promoted Turn‐On Fluorescence for Selective Sensing of Organic Amines in a Tb III ‐based Macrocyclic Framework

Autor: Zheng Niu, Yingxiang Ye, Ayman Nafady, Junyu Ren, Shengqian Ma, Shixi Liu, Xianqiang Huang, Chen-Yen Tsai, Qing-Zhi Liu
Rok vydání: 2021
Předmět:
Zdroj: Angewandte Chemie International Edition. 60:23705-23712
ISSN: 1521-3773
1433-7851
DOI: 10.1002/anie.202107436
Popis: Guided by a second-sphere interaction strategy, we fabricated a Tb(III)-based metal-organic framework (MMCF-4) for turn-on sensing of methyl amine with ultra-low detection limit and high turn-on efficiency. MMCF-4 features lanthanide nodes shielded in a nonacoordinate geometry along with secondary coordination spheres that are densely populated with H-bond interacting sites. Nonradiative routes were inhibited by binding-induced rigidification of the ligand on the second coordination sphere, resulting in luminescence amplification. Such remote interacting mechanism involved in the turn-on sensing event was confirmed by single-crystal X-ray diffraction and molecular dynamic simulation studies. The design of both primary and secondary coordination spheres of Tb(III) enabled the first turn-on sensing of organic amines in aqueous conditions. Our work suggests a promising strategy for high-performance turn-on sensing for Ln-MOFs and luminous materials driven by other metal chromophores.
Databáze: OpenAIRE
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