الفهرس 
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Abstract
This study contains interaction of CuBr2 with oxalic, maleic, and malonic acids as ligands in the KBr solution. The electrochemical behavior for CuBr2 was studied in the absence and presence of different acids concentration and discussed with knowledge of entropy and enthalpy of complexation. Also, cyclic voltammetry technique is used to determine the electrochemical behavior of NiCl2 in citric acid in the presence of potassium ferrioxalate by reacting with dithizone (diphenylthiocarbazone) as a complexing agent on the other side we characterized Mn(II) mixed-ligand complexes by different analysis to confirm the structure.
. The biological activety of prepared Mn(II) mixed-ligand complexes are studied.