A. F. Shoair, A. El-Shobaky, E. A. Azab
Mar 1, 2015
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0
Influential Citations
11
Citations
Journal
Journal of Molecular Liquids
Abstract
Abstract 5-Chloro-3-hydroxy-4-(phenylediazenyl)pyridine-2(1H)-one and its derivatives (HL n ) were synthesized and characterized using different spectroscopic techniques. The geometrical structures of the ligands are carried out by HF method with 3-21G basis set. The proton–ligand dissociation constant of the ligands (HL n ) and their metal–ligand stability constants with (Mn 2 + , Co 2 + , Ni 2 + and Cd 2 + ) have been determined potentiometrically. The potentiometric studies were carried out in 0.1 M (KCl) and 10% (by volume) DMF–water mixture. The effect of temperature was studied at (298, 308 and 318 K) and the corresponding thermodynamic parameters (Δ G , Δ H and Δ S ) were derived and discussed. The dissociation process is non-spontaneous, endothermic and entropically unfavorable. The formation of the metal complexes has been found to be spontaneous, endothermic and entropically favorable.