A novel oxalato-bridged dinuclear copper(II) complex with diazamesocyclic terminal ligand: crystal structure, spectroscopy and magnetism

The synthesis of a new oxalato-bridged dinuclear Cu(II) complex, [Cu2(DACO)2(μ-ox)Br2]·CH3OH (1), where DACO=1,5-diazacyclooctane, together with its spectral and magnetic characterization, are reported. Crystal structure of 1 has been determined by X-ray diffraction analysis, which is made up of centrosymmetric dinuclear [Cu2(DACO)2(μ-ox)Br2] unit and noncoordinated methanol molecule, assembling into a novel two-dimensional step-like extended network through hydrogen bonds. The magnetic susceptibility indicates that complex 1 is anti-ferromagnetic coupling with 2J=−242 cm−1. The strength of the exchange interaction is discussed on the basis of the structural feature.