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Sensing of heavy metal ions. (a) Design strategy for COF-LZU8 and the fluorescence quenching mechanism triggered by the addition of Hg2+ ions. Reproduced with permission from ref (29). Copyright 2016 American Chemical Society. (b) Selectivity of TFPT-BTAN-AO for UO22+. Reproduced with permission from ref (32). Copyright 2020 The Authors under Creative Commons Attribution 4.0 International license (https://creativecommons.org/licenses/by/4.0/).
