Mixed Ligand Complexes of Cu(II) with Reactive Methylene Compounds of Malonamic Acid Series and Oxalic Acid

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The mixed ligand complexes of N-(2-ethoxy) phenyl malonamate (EPM-), N-(4-methyl phenyl malonamate (MPM-) and oxalate (OX2-) with Cu(II) have been studied polarographically at constant ionic strength μ =2.0 (NaNO3) and pH 5.6 at 25±0.1°C. The reduction of simple and mixed complexes has been found to be reversible and diffusion-controlled. The stability constant of simple system has been determined before the study of mixed ligand complex by the method of De-Ford and Hume¹. The stability constants of the mixed ligand complexes [Cu(OX)(MPM)- and [Cu(OX)(EPM)]- are found to be log b11=12.25 and log b1=10.82 respectively. Oxalic acid, N-(2-ethoxy) and N-(4-methyl) phenyl malonamic acid are abbreviated as OX2-, EPM- and MPM- respetively.

Polarogrpahic study; mixed ligand complexes; Malonamic acid; oxalic acid