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Abstract
The ion-associate complexes of Promazine (Prom.Cl), Chlorpromazine (Chlorprom.Cl), Promethazine (Prometh.Cl), Imipramine (Imip.Cl) and Ciprofloxacin (Cipro.Cl) hydrochlorides with potassium ferricyanide, ammonium reineckate and sodium cobaltinitrite have been prepared. The precipitated ion-associates were subjected to elemental analyses, infrared spectral studies, thermogravimetric analysis and determination of the metal content for elucidation of their structures. The solubilities of the solid ion-associate complexes have been studied and their solubility products were determined at different temperatures at the optimum conditions of pH and ionic strength for their quantitative precipitation. The thermodynamic parameters ΔH, ΔG and ΔS for the dissolution of the ion-associate complexes were calculated.