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Three Cadmium Coordination Polymers with Carboxylate and Pyridine Mixed Ligands: Luminescent Sensors for FeIII and CrVI Ions in an Aqueous Medium

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journal contribution
posted on 21.09.2017, 20:13 authored by Yanna Lin, Xiaoping Zhang, Wenjie Chen, Wei Shi, Peng Cheng
Three new water-stable luminescent Cd­(II) coordination polymers (CPs), {[Cd2(bptc)­(2,2′-bipy)2(H2O)2]}n (1), {[Cd2(bptc)­(phen)2]·4H2O}n (2), and {[Cd2(bptc)­(4,4′-bipy)­(H2O)2]·4H2O}n (3), were solvothermally synthesized with mixed ligands of 3,3′,5,5′-biphenyltetracarboxylic acid (H4bptc) and N-donor ligands (2,2′-bipy = 2,2′-bipyridine; phen = 1,10-phenanthroline; 4,4′-bipy = 4,4′-bipyridine). The CPs 13 show structural diversity from a 1D ladder chain to a 2D layer to a 3D porous framework, tuned by different ancillary ligands. Topological analyses reveal that the CP 2 is a 4-connected uninodal 2D net with the Schläfli point symbol {44·62}, while the CP 3 displays a 4,6-connected 2-nodal 3D net with the point symbol {3·42·52·6}­{32·42·52·64·74·8}. Luminescent property studies reveal that the CPs 13 are promising luminescent sensors that can highly select and sensitively detect ferric and chromate/dichromate ions, in which the CP 1 with a 1D structure showed the best performance, free from the interference of other ions present in an aqueous medium. Moreover, the mechanism for the sensing properties was studied in detail.