The ligand 4-(4′-phenyl-2′-thiazolylazo)-resorcinol (L) was prepared. The ionization constants of the ligand (pK a ) and the stability constants of the complexes with Co(II), Ni(II), Cu(II), Zn(II), and Cd(II) have been estimated spectrophotometrically and pH-metrically at 298 K. The effect of some organic solvents and pH on the absorption spectra of the ligand and its complexation with the cations above was studied and discussed. The use of this ligand for spectrophotometric determination of the cations under investigation was also studied. Stoichiometric complexes with ratios 1:1 and 1:2 (M:L) were formed for all cations used except Cd(II) which forms only a 1:1 stoichiometric complex. Also, a conductometric study has been carried out, and the results show that the same stoichiometric complexes have formed in the solution.
A new Coumarine derivatives azo dye; 8-(3-phenyl-5-pyrazolylazo)-7-Hydroxy-4-Methyl Coumarine were synthesized. The effect of pH on the spectra of the synthesized ligand, the chromogenic reaction and the stability constant of Co+ 2, Cu+ 2, Ni+ 2, and Zn+ 2 ion complexes with the synthesized ligand were studied and determined conductmetrically and spectrophotometrically. The optimum pH was determined for the complexes. 1:1and 2:1(L:M) stoichiometric complexes has been formed in solutions. The order of the stability constants of the complexes under study was; Co+ 2<Ni+ 2< Cu+ 2. These metal ions were determined using the ligand as indicator. The ligand can be used as acid-base indicator. The ability of controlling corrosion of carbon steel in 1M of acidic solution of hydrochloric was electrochemically proven at room temperature. The inhibition indicated with different tests including Open circuit potential (OCP), Potentiodynamic Polarization (PP) and Electrochemical Impedance Spectroscopy (EIS) tests. The adsorption of inhibitor indicated from PP test followed Longmuir isotherm. Adsorption constant and Gibbs free energy were also calculated and explained.
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