Nickel(II) and Copper(II) chelates of 4-(-thiazolylazo)resorcinol (TAR) were reported. 2T he dissociation constants of the ligand and the stability constants of the metal complexes were calculated pH-metrically and spectrophotometrically at 25 • C, in 50% (v/v) ethanol and 0.1 M ionic strength. The effects of an acid or a base on the visible absorption behaviour of the ligand and complexes has been investigated. Nickel and copper react with 4-(-2t hiazolylazo)resorcinol (TAR) to form a binary complexes. The equilibria occurring in solution were established and the basic characteristics of the complexes formed were determined. The complexation reaction in the systems investigated were demonstrated and characterized using graphical logarithmic analysis of the absorbance versus pH graph. The composition of the formed complexes with the reagent have been determined. The molar absorptivity of the binary system is investigated. The binary systems obeyed beer's law up to 0.23 and 0.25 µg/ml for Ni 2+ and Cu 2+ respectively. A simple and highly sensitive procedure for spectrophotometric determination of Ni 2+ and Cu 2+ has been developed. A method for the simultaneous determination of nickel and copper in mixtures by first-derivative spectrophotometry is described. Zero-crossing measurement technique is found suitable for the simultaneous determination of the metal ions. The method has been applied to direct determination of copper and nickel in dome synthetic mixtures without any separation.
Metal complexes of the divalent ions Ni, Cu and Zn with a Schiff base obtained through condensation of salicylaldehyde with 2-aminothiazole has been investigated potentiomerically and spectrophotometrivally. The stoichiometric formula of the obtained complexes are: Ni(SAT)2, Cu(SAT)2 and Zn(SAT) where: SAT = saliciliden 2-aminothiazole. The formation constants of proton-ligand and metal-ligand complexes have been determined at 25 o C and 0.1 M (NaClO4) ionic strength in 50% (V/V) ethanol -water solution. The formation constants values obtained from spectrophotometric studies are found to be consistent with those obtained from potentiometric studies. The complexation reaction in the systems investigated were demonstrated and characterized using graphical logarithmic analysis of the absorbance versus pH graph. The binary systems obeyed beer's law up to 0.21, 0.19 and 0.24 µg/ml and the molar absorptivity ɛ = 3.12 x 10 3 , 2.16 x 10 3 3.80 x 10 3 l mol -1 cm -1 for Ni 2+ , Cu 2+ and Zn 2+ respectively.
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