Angewandte Chemie - International Edition p. 9319 - 9323 (2020)
Update date:2022-08-11
Topics:
Drake, Hannah F.
Huang, Yanyan
Li, Jialuo
Liu, Wenshe R.
Pang, Jiandong
Qin, Jun-Sheng
Yuan, Shuai
Zhang, Peng
Zhang, Yingmu
Zhou, Hong-Cai
The controlled synthesis of multicomponent metal–organic frameworks (MOFs) allows for the precise placement of multiple cooperative functional groups within a framework, leading to emergent synergistic effects. Herein, we demonstrate that turn-on fluorescence sensors can be assembled by combining a fluorophore and a recognition moiety within a complex cavity of a multicomponent MOF. An anthracene-based fluorescent linker and a hemicyanine-containing CN?-responsive linker were sequentially installed into the lattice of PCN-700. The selective binding of CN? to hemicyanine inhibited the energy transfer between the two moieties, resulting in a fluorescence turn-on effect. Taking advantage of the high tunability of the MOF platform, the ratio between anthracene and the hemicyanine moiety could be fine-tuned in order to maximize the sensitivity of the overall framework. The optimized MOF-sensor had a CN?-detection limit of 0.05 μm, which is much lower than traditional CN? fluorescent sensors (about 0.2 μm).
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