Ligational and analytical applications of a uracil derivative toward some transition metal ions

New complexes of the uracil derivative (5,6-diamino-2,4-dihydroxypyrimidine) hemisulfate (H2AHP) having the formulas [Fe(HAHP)2Cl(H2O)]H2O, [M(HAHP)2(H2O)2]MeOH (M = Co, Ni), [Cu(HAHP)(H2AHP)(H2O)Cl]H2O, [Zn(HAHP)2]H2O, [MoO2(HAHP)2]4H2O, [Ru(HAHP)2(H2O)2], [Rh(HAHP)2(H2O)Cl], [Pd(AHP)n]H2O, [Ag2(H2AHP)(H2O)4](NO3)2 and [Au(H2AHP)Cl3]H2O have been characterized by IR, electronic, 1HNMR and mass spectral studies, magnetic and thermal measurements. Cyclic voltammetry was used to study the electrochemical behavior of the Ru and MoO2 complexes. Formation of complexes in solution was studied pH metrically and their stability constants clearly indicate that the divalent metal ions have the order: Pd(II) > Cu(II) > Co(II) ∼ Ni(II) > Zn(II) while Ru(III) > Rh(III) > Au(III) > Fe(III) is the order of the trivalent ions. A flotation procedure for the separation of Ag(I), Pd(II), Pt(IV) and Au(III) individually or in combination has been described. The maximum separation of each analyte is achieved using 2 × 10−4 M ...