10.22376/ijpbs.2019.10.1.p1-12 Volume 6 Issue 4 2015 (October - December) The mononuclear copper(II) complex, Cu(phen)(H lessThan sub greaterThan 2 lessThan /sub greaterThan O)(NO lessThan sub greaterThan 3 lessThan /sub greaterThan ) lessThan sub greaterThan 2 lessThan /sub greaterThan (1) has been obtained by the reaction of 1,10-phenanthroline with Cu(NO lessThan sub greaterThan 3 lessThan /sub greaterThan ) lessThan sub greaterThan 2 lessThan /sub greaterThan .3H lessThan sub greaterThan 2 lessThan /sub greaterThan O in methanol solution .The complex reacts with mono anionic ligands Cl lessThan sup greaterThan - lessThan /sup greaterThan , Br lessThan sup greaterThan - lessThan /sup greaterThan , I lessThan sup greaterThan - lessThan /sup greaterThan and CH lessThan sub greaterThan 3 lessThan /sub greaterThan O lessThan sup greaterThan - lessThan /sup greaterThan in methanolic solution to form the stable binuclear complexes [Cu(phen)(µ-X)(H lessThan sub greaterThan 2 lessThan /sub greaterThan O)] lessThan sub greaterThan 2 lessThan /sub greaterThan (NO lessThan sub greaterThan 3 lessThan /sub greaterThan ) lessThan sub greaterThan 2 lessThan /sub greaterThan . Where, X = Cl lessThan sup greaterThan - lessThan /sup greaterThan (2), Br lessThan sup greaterThan - lessThan /sup greaterThan (3), I lessThan sup greaterThan - lessThan /sup greaterThan (4), and CH lessThan sub greaterThan 3 lessThan /sub greaterThan O lessThan sup greaterThan - lessThan /sup greaterThan (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. S. CHANDRASEKHAR,B. MOKSHARAGNI AND K. HUSSAINREDDY Synthesis, dinuclear copper(II) complexes, 1,10-phenanthroline, spectral studies, DNA binding studies. 25-39