Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.004 Å; R factor = 0.037; wR factor = 0.104; data-to-parameter ratio = 13.5.In the title compound, {[Cu(C 11 H 5 NO 4 )(H 2 O) 2 ]ÁH 2 O} n , the Cu II ion is five-coordinated by two O atoms and one N atom of two symmetry-related quinoline-2,3-dicarboxylate ligands, and two water molecules. The water molecules occupy basal and apical positions of the square-pyramidal coordination polyhedron. Each quinoline-2,3-dicarboxylate dianion bridges two adjacent Cu II ions, forming a polymeric chain along [010]. The chains are further connected via O-HÁ Á ÁO hydrogenbonding interactions and quinoline ring -interactions [centroid-centroid distance = 3.725 (4) Å ], generating a threedimensional structure. Lattice water molecules participate in the crystal structure via O-HÁ Á ÁO hydrogen bonds.
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In the title compound, [Co(C6H3ClNO2)2(H2O)4]·4H2O, the CoII cation is located on an inversion center and is coordinated by four water molecules and two 6-chloropyridine-3-carboxylate anions in a slightly distorted octahedral geometry. In the crystal, complex molecules and lattice water molecules are linked by O—H⋯O and O—H⋯N hydrogen bonds into a three-dimensional network.
Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.003 Å; R factor = 0.028; wR factor = 0.076; data-to-parameter ratio = 17.7.In the title compound, [Ni(C 6 H 3 ClNO 2 ) 2 (H 2 O) 4 ]Á4H 2 O, the Ni II ion is located on an inversion centre and is octahedrally coordinated by four O atoms from four water molecules in the equatorial plane and two O atoms of two 6-chloro-3-carboxylate ligands in axial positions. There are also four lattice water molecules present. The organic ligands are bound to the Ni II ion in a monodentate manner through a carboxylate O atom. There is one strong intramolecular O-HÁ Á ÁO hydrogen bond and six intermolecular O-HÁ Á ÁO and O-HÁ Á ÁN hydrogen-bonding interactions in the packing, resulting in a complex three-dimensional network structure.
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