Two tetranuclear Ni(II) complexes from substituted imidazole dicarboxylates: syntheses,structures, thermal and magnetic properties |
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| Authors: | Hongliang Jia Zifeng Li Qing Chen |
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| Affiliation: | 1. College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, Henan, P.R. China;2. Zhengzhou Kindergarten Teachers' College, Zhengzhou 450000, Henan, P.R. China |
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| Abstract: | Two tetranuclear nickel(II) complexes, [Ni4 (p-BrPhHIDC)4(py)4(H2O)4]·CH3OH (p-BrPhH3IDC = 2-(p-bromophenyl)-1H-imidazole-4,5-dicarboxylic acid) (1) and [Ni4(p-ClPhHIDC)4 (CH3CN)4(H2O)4]·4H2O (p-ClPhH3IDC = 2-(p-chlorophenyl)-1H-imidazole-4,5-dicarboxylic acid, py = pyridine) (2), have been solvothermally synthesised and structurally characterised. Both compounds consist of similar tetranuclear Ni(II) cores, in which the imidazole dicarboxylate ligands adopt the similar coordination mode. The thermal properties of 1 and 2 have been investigated. Also, it is discovered that there exists antiferromagnetic coupling between the Ni(II) ions in 1 and 2; the best fittings to the experimental magnetic susceptibilities gave J = ? 9.89 cm? 1 and g = 2.18 for 1, and J = ? 10.54 cm? 1 and g = 2.14 for 2. |
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| Keywords: | imidazole dicarboxylate nickel tetranuclear crystal structure magnetic |
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