Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.005 Å; R factor = 0.044; wR factor = 0.127; data-to-parameter ratio = 17.7.The title complex, [Zn(NO 3 ) 2 (C 3 H 4 N 2 ) 2 ], contains a Zn II centre with a slightly distorted tetrahedral coordination environment, involving two N atoms from imidazole ligands and two O atoms from nitrate anions. The imino NH groups participate in intermolecular N-HÁ Á ÁO hydrogen bonds.
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Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.006 Å; R factor = 0.042; wR factor = 0.102; data-to-parameter ratio = 14.0.The title compound, [ZnCl 2 (C 18 H 14 N 4 O)], crystallizes with two molecules in the asymmetric unit, which differ in the tautomeric (neutral and zwitterionic) forms of the coordinating organic ligand. In both molecules, the Zn II atom adopts a distorted square-pyramidal geometry by two N and one O atoms of the Schiff base ligand and two Cl atoms acting as monodentate chloride anions. The crystal packing is stabilized by N-HÁ Á ÁN and N-HÁ Á ÁCl hydrogen bonds, forming a twodimensional network parallel to the ac plane.
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The Zn atom in the title complex, [Zn(C4H4O6)(C3H4N2)2]n, is in an octahedral environment comprising two N atoms fom the imidazole ligands and four O atoms from the tartrate ligands. The imino groups participate in intramolecular N—H⋯O hydrogen bonds, as do the O atoms.
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