A series of binuclear copper (Il) complexes containing a-diimine ligand has been synthesized and characterized by electron paramagnetic resonance spectroscopy. The copper complexes of the formis monodentate ligand and L is bridging ligand, were studied. The EPR spectra were recorded in solution and frozen glassy solution. In the frozen solution spectra, the values of g II are in the range of 2.10to 2.20,and theg.L are in the range of 2.03to Ul6. Furthesmore, the values of A II are in the range of 170to 188gauss, and the A.1 are in the range of 17to 32gauss.The data indicate that the structure of Cu(II) complexes is axial symmetry in square pyramidal form.