SYNTHESES, STRUCTURES, AND PROPERTIES OF THE DINUCLEAR COPPER(II) ANDNICKEL(II) COMPLEXES BRIDGED BY AN ALKOXIDE AND A PYRIDAZINE OR A PHTHALAZINE

In this paper we report our recent research on the dinuclear copper(II ) and nickel(II) complexes 1-10 (Chart 1) containing Schiff bases, der ived from acetylacetone, benzoylacetone, or trifluoroacetylacetone, an d 1,3-diaminopropane-2-ol. These complexes are bridged by an alkoxide and a pyridazine (pyd) or phthalazine (phta). The magnetic susceptibil ities, visible absorption spectra, conductivities, and redox propertie s of the complexes were investigated and the molecular structures of 2 , 4, and 5 are described. The Cu-O-Cu angles found in these complexes indicate a role of the alkoxo-bridge as one of the principal antiferro magnetic exchange pathways. At the same time, the coplanarity of two c oordination planes of copper(II) ions is also shown to relate to the e xchange process.