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metal-organic compounds
In the title polymeric complex, {[Zn(C8H4O4)(C3H4N2)2]·3H2O}n, the ZnII atom is coordinated by two terephthalate dianions and two imidazole ligands in a distorted tetrahedral geometry. The terephthalate dianions are located on inversion centres and bridge neighbouring ZnII atoms to form zigzag polymeric complex chains. The interplanar distance of 3.212 (17) Å between parallel imidazole rings of adjacent polymeric chains suggests the existence of π–π stacking.
metal-organic compounds
In the title complex, [Ni(C4H4O5)(C3H4N2)3], the NiII atom is coordinated by one tridentate malate dianion and three imidazole molecules with a distorted octahedral geometry. The imidazole H atom links with both carboxyl O atoms of the neighboring complex to form a three-centered hydrogen bond, which results in a long centroid–centroid distance of 4.447 (2) Å between neighboring parallel imidazole rings.
metal-organic compounds
The structure of the title complex, [Co(C8H7O3)2(H2O)2], has been redetermined in the space group C2/c. The original report [Xiao, Lan, Zhang & Jiang (2002). Guangxi Shifan Daxue Xuebao Ziran Kexueban (J. Guangxi Normal Univ.), 20, 81–83] declared the space group to be Cc. The molecule lies on a twofold axis; the vanillinate anion chelates to the CoII atom through the methoxy and hydroxy groups. The Co—Omethoxy bond is longer than the Co—Ohydroxy bond by 0.2673 (18) Å.
metal-organic compounds
In the title compound, [Cd(C7H5O3)2(C7H6N2)2]·H2O, the CdII ion is surrounded by two salicylate anions and two benzimidazole molecules in a strongly distorted octahedral cis-CdN2O4 geometry. The partially overlapped arrangement and the face-to-face distances of 3.22 (3) and 3.34 (2) Å suggest π–π stacking between the benzimidazole ligands of neighbouring molecules.
metal-organic compounds
In the title complex, {[CaMn(C4H4O5)2(H2O)6]·2H2O}n, the CaII and MnII ions are bridged by oxydiacetate (ODA) dianions to form zigzag polymeric chains. The CaII ion is located at a twofold axis and is coordinated by two tridentate ODA and two water molecules with a distorted tetragonal antiprism coordination geometry. The MnII ion is located at another twofold axis, and assumes a distorted octahedral coordination geometry formed by four water molecules and two carboxyl O atoms from monodentate ODA dianions also chelating to the neighboring CaII atoms.
