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The title compounds, [Co(H2O)6](OVA)2·2H2O 1, [Ni(H2O)6](OVA)2·2H2O 2 and [Zn(OVA)2·2H2O] 3 (HOVA = o-vanillic acid = 2-hydroxy-3-methoxybenzoate), were synthesized and characterized by single-crystal X-ray diffraction, elemental analysis, IR and TGA. Compounds 1 and 2 are both of triclinic with space group P1. The metal atom coordinated by six water molecules displays a slightly distorted octahedral configuration. Interestingly, the carboxyl group from HOVA ligand does not coordinate to the metal atom. Correspondingly, compound 3 belongs to the monoclinic system, space group C2/c. Each zinc(Ⅱ) atom exhibits a distorted four-coordinated tetrahedral geometry. Two monodentate carboxyl groups link one zinc(Ⅱ) atom to form a mononuclear molecule. The structure feature is different from that of compounds 1 and 2, which could be attributed to the different coordinated numbers and radii of Co(Ⅱ), Ni(Ⅱ) and Zn(Ⅱ) atoms.
The title compounds [Co (H2O) 6] (OVA) 2 · 2H2O 1 [Ni (H2O) 6] (OVA) 2 · 2H2O 2 and [Zn (OVA) 2 · 2H2O] 3 acid = 2-hydroxy-3-methoxybenzoate, were synthesized and characterized by single-crystal X-ray diffraction, elemental analysis, IR and TGA. Compounds 1 and 2 are both triclinic with space group P1. The metal atom coordinated by six Correspondingly, the compound group 3 belongs to the monoclinic system, space group C2 / c. Each zinc (Ⅱ) atom exhibits a distorted Four-coordinated tetrahedral geometry. Two monodentate carboxyl groups link one zinc (II) atom to form a mononuclear molecule. The structure feature is different from that of compounds 1 and 2, which could be attributed to the different coordinated numbers and radii of Co ( Ⅱ), Ni (Ⅱ) and Zn (Ⅱ) atoms.