MAGNETIC-PROPERTIES AND CRYSTAL-STRUCTURE OF A 1D ALTERNATING CHAIN COPPER(II) COMPOUND WITH BRIDGING FUMARATE AND TRANS-OXAMIDATE LIGANDS

The complex polymer [Cu2(oxap)(fum)]n.5nH2O, where oxap and fum are di anions of N,N'-bis(2-aminopropyl)oxamide and of fumarate, respectively , was prepared and characterized by means of X-ray crystallography, ma gnetic and spectroscopic measurements. The structure of this compound consists of alternating chains of copper(II) ions bridged by both oxap and fumarate ligands. The central copper atom is located in an approx imately square planar environment. The compound exhibits strong antife rromagnetic coupling with J = -390 cm-1, due to the efficiency of the oxamidato bridge in propagating antiferromagnetic exchange interaction between copper(II) ions which are separated by more than 5.2 angstrom .