POTENTIOMETRIC AND SPECTROSCOPIC STUDIES OF NICKEL(II), COPPER(II) AND ZINC(II) COMPLEXES WITH SALICILIDEN 2-AMINOTHIAZOLE | ||||
| Al-Azhar Bulletin of Science | ||||
| Article 13, Volume 2011, Issue 12, December 2011, Page 153-164 PDF (522.38 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/absb.2011.7024 | ||||
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| Authors | ||||
| MAHMOUD H. MOUSTAFA* 1; ABED ELHALEEM M. HESSEEN1; MOUSTAFA K. HASSAN2; EHAB M. ABED ALLAHA1 | ||||
| 1Department of Chemistry, Faculty of Science, Al-Azhar University, Assiut Branch, Assiut, Egypt | ||||
| 2Department of Chemistry, Faculty of Science, Assiut University, Assiut, Egypt | ||||
| Abstract | ||||
| 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 oC 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 103, 2.16 x 103 3.80 x 103 l mol-1 cm-1 for Ni2+, Cu2+ and Zn2+ respectively. | ||||
| Keywords | ||||
| Nickel(II), Copper(II) and Zinc(II); Schiffbase; Stability constants; Stoichiometry; POTENTIOMETRIC TITRATIONS; spectrophotometric study | ||||
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