Synthesis, spectral characterization and magnetic properties of dicarboxylato-bridged dinuclear copper(II) complexes with N-pyridylsalicylidenaminato ligand

The synthesis and characterization of mixed-ligand copper(II) complexes with bridged dicarboxylato groups, of the composition [(PS)Cu](2)L . nH(2)O, where PS = N-pyridylsalicylidenaminato, L = malonato, phthalato and terephthalato, and n = 8, 5, 2, respectively, are reported. PS coordinates as a monoanionic bidentate ligand, while carboxylate coordinates as a monodentate ligand. The stereochemistry around copper is distorted octahedral for malonato, square pyramidal for phthalato and square planar for terephthalato complexes. EPR spectra for polycrystalline complexes at room temperature were characterized by axial symmetry (g(parallel to) > g(perpendicular to)) and correspond to non-interacting dimeric units. However, the anomalous magnetic moment data suggest intermo!eculr interactions as an efficient exchange pathway.