A cobalt­(II) coordination polymer with an unusual 4,4,4-connected network was hydrothermally synthesized and observed with high thermal, solvent, and pH stabilities. This polymer can serve as the first dual-responsive fluorescent chemosensor for the selective detection of acetylacetone and Cr2O7 2– ion (pH 3.0) in aqueous systems.

Two new CPs, namely {[Cd(L)(1,4-PDA)]·0.7(C2H5OH)}n (1) and {[Cd(L)0.5(1,8-NDC)·H2O]}n (2) were fabricated. 1 shows a sql 2D network. 2 shows a 2D 3,4L83 network. Both 1 and 2 were highly selective and sensitive fluorescent chemosensors toward acetylacetone and Fe3+.

Five CdII-based MOFs with different topologies were prepared, in which 2 and 3 are rare examples which display excellent sensitivity, selectivity, recyclability and structural stability for detection of acac/Fe3+ and acac/Cr2O72−, respectively.

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The title compound, [Cu2(C7H3NO4)2(C7H8N4)(H2O)2]·4H2O, has a dinuclear structure in which each CuII atom is five‐coordinate in a distorted square‐based pyramidal geometry and the 1,1′‐methyl­enedi‐1H‐imidazole ligand adopts a bis‐monodentate bridging mode, linking the CuII atoms. A twofold rotation axis passes through the C atom linking the imidazole rings. The mol­ecules are connected by O—H⋯O hydrogen bonds [O⋯O = 2.748 (3)–2.973 (3) Å].

The title compound, [Cu(C4H2O4)(C12H12N2)(H2O)]n, has a neutral polymeric chain structure in which fumarate ligands link the Cu atoms; the chains are then linked together by hydrogen bonds. The unique CuII ion exhibits a distorted octa­hedral coordination geometry defined by three O atoms of two different centrosymmetric fumarate ligands, two N atoms from the chelating dmbpy ligand (dmbpy is 4,4′‐dimethyl‐2,2′‐bipyridine) and one water mol­ecule. The fumarate ligands show two types of coordination modes, viz. bis‐bidentate‐chelating and bis‐mono‐O‐carboxyl­ate bridging.

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