Abstract
Six new μ-tetracarboxylato binuclear nickel(II) complexes have been synthesized, namely [Ni2(PMTA)(L)4] [L denotes 2,2′-bipyridine (bpy), 1,10-phenanthroline (phen), 5-methyl-1,10-phenanthroline (Me-phen), 5-chloro-1,10-phenanthroline (Cl-phen), 4,4′-dimethyl-2, 2′-bipyridine (Me2bpy) and 5-nitro-1, 10-phenanthroline (NO2-phen)], where PMTA is the tetraanion of pyromellitic acid. Based on the elemental analyses, molar conductance and room temperature magnetic moment measurements, IR and electronic spectral studies, these complexes are proposed to have PMTA-bridged structures consisting of two nickel(II) ions, each in a distorted octahedral environment. The complexes [Ni2(PMTA)(bpy)4] (1) and [Ni2(PMTA)(phen)4] (2) were further characterized by variable temperature magnetic susceptibility (4∼300 K) and the data were treated in terms of two theoretical models, giving the exchange integrals J = - 0. 95 cm−1 for (1) and J = - 1.20 cm−1 for (2). The result indicates a very weakly antiferromagnetic spin-exchange interaction between the metal ions within each molecule.
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