The mononuclear copper(II) complex, Cu(phen)(H₂O)(NO₃)₂ (1) has been obtained by the reaction of 1,10-phenanthroline with Cu(NO₃)₂.3H₂O in methanol solution .The complex reacts with mono anionic ligands Cl^-, Br^-, I^- and CH₃O^- in methanolic solution to form the stable binuclear complexes [Cu(phen)(µ-X)(H₂O)]₂ (NO₃)₂. Where,  X = Cl^-(2), Br^- (3), I^- (4), and CH₃O^- (5). These complexes were characterized by electronic, IR, ESR, magnetic moments and conductivity measurements.  The electrochemical behaviour of these complexes has been investigated by using cyclicvoltammetry. The interactions of these complexes with calf thymus DNA were investigated using absorption spectrophotometry. Electronic absorption data suggest that the complexes bind DNA via intercalation.