Potentiometric Study Of Metal Complexes Of Some Imidazole Contained Ligandsc Part II: The Determination Of Dissociation Constant Of  2-[4,5-Bis(4-Methylphenyl)-1H-Imidazol-2- Yl] Phenol [Me-HPI] And The Stability Of Its Complexes With Some Transition Metal Ions.

R. Al-Jourany, Kamal

	Potentiometric Study Of Metal Complexes Of Some Imidazole Contained Ligandsc Part II: The Determination Of Dissociation Constant Of 2-[4,5-Bis(4-Methylphenyl)-1H-Imidazol-2- Yl] Phenol [Me-HPI] And The Stability Of Its Complexes With Some Transition Metal Ions.
Al-Mustansiriyah Journal of Science
Article 1, Volume 23, Issue 4, 2012, Pages 29-40
Author
Kamal R. Al-Jourany
Abstract
Acidity constant (dissociation) together with the formation (stability) constants of the (Me-HPI) with some transition metal ions (Cu (II), Ni (II), Co (II) and Zn (II)) were determined in mixed aqueous/dioxane solution at 35 °C. The coordination in case of formation of both protonated ligand and complexes was achieved potentiometrically by adapting "competition method". The acidity function was measured throughout the titration of acidified ligand and alkali, in case of determination of the dissociation constant; with the determination of the stability constants of the complexes, a calculated amount of metal ion has been added to the reaction. The ionic strength was kept constant during the coordination by using a strong electrolyte salt (0.1 mol.dm-3 of KCl). A computer program (HYPERQUADE 2008 ) was used to determine the dissociation constants and other neutral and hydrolyzed metal complexes

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