Abstract
Four new NiII–NiII–NiII homotrinuclear complexes namely [Ni(α-BD)2{NiL2}](ClO4)2 [L = 1,10-phenanthroline (phen), 5-nitro-1,10-phenanthroline (5-NO2-phen), 2,2′-bipyridyl (bpy) or 4,4′-dimethyl-2,2′bipyridyl (Me2bpy) and (α-BD)− = α-benzyldioximato ion] have been prepared and characterized. Based on elemental analyses, i.r. spectra, conductivity measurements, extended α-benzyldioximato-bridged systems consisting of three nickel(II) ions in which the central nickel(II) ion has a square-planar environment and the end capped two nickel(II) ions have a distorted octahedral environment are proposed for these structures. The temperature dependence of the magnetic susceptibility for complexes (1) (phen), (2) (5-NO2-phen), (3) (bpy) and (4) (Me2bpy) were measured over the 77–300 K range and the observed data were successfully simulated by an equation based on the spin Hamiltonian operator (H^ = −2JS^1S^2), giving the exchange integral J = −13.31 cm−1 for (1), J = −7.37 cm−1 for (2), J = −8.96 cm−1 for (3) and J = −7.33 cm−1 for (4) These results indicate a weak antiferromagnetic spin exchange interaction between the two terminal nickel(II) io
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Zhang, SW., Yan, SP., Liao, DZ. et al. Synthesis and magnetic properties of trinuclear nickel(II) complexes bridged by α-benzyldioximato groups. Transition Metal Chemistry 22, 42–45 (1997). https://doi.org/10.1023/A:1018417703144
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DOI: https://doi.org/10.1023/A:1018417703144