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Abstract Two novel metal–organic frameworks (MOFs), Cd(L)(BPDC)(H 2 O)·DMA ( 1 ) and Co(L)(BPDC)(H 2 O)·2H 2 O ( 2 ), were solvothermally synthesized using 3,3′‐bis(1H‐imidazol‐1‐yl)biphenyl (L) and biphenyl‐4,4′‐dicarboxylic acid (H 2 BPDC) as mixed ligands, with Cd(NO 3 ) 2 ·4H 2 O and Co(NO 3 ) 2 ·6H 2 O as metal sources, respectively. 1 is characterized by a theoretically porous three‐dimensional framework, whereas 2 is constructed as a three‐dimensional supramolecular framework. A significant influence of the distinct coordination geometries of the metal centers on the structural architectures was observed, as evidenced by the unique configurations of the Cd/Co‐MOFs. Reliable thermal stability was demonstrated for both 1 and 2 by thermal stability tests. The fluorescent properties of 1 were investigated in depth, and its capability for accurate recognition of Fe 3+ , CrO 4 2− , and Cr 2 O 7 2− in aqueous solution through fluorescence turn‐off response was revealed. High sensitivity and a low detection limit were exhibited by this recognition system, suggesting that 1 can be considered a potential identification tool for the detection of heavy metal contaminants in aqueous environments. UV–vis spectroscopy indicates that competitive absorption is the primary cause of variation in the fluorescence signal.
Zhao et al. (Tue,) studied this question.