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Stability Studies of Selected Metal Ions Chelates with 2-(4-amino-1,5- dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-ylideneamino) Phenol

Gouda, Gamal A. and Ali, Gomaa A. M. and Elnasr, Tarek A. Seaf (2015) Stability Studies of Selected Metal Ions Chelates with 2-(4-amino-1,5- dimethyl-2-phenyl-1,2-dihydro-pyrazol-3-ylideneamino) Phenol. International Journal of Nanomaterials and Chemistry, 1 (2). pp. 39-44. ISSN 2090-9578 (Print); 2090-9586 (Online)

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Abstract

Acid dissociation and complex stability constants of 2-(4-Amino-1,5-dimethyl-2-phenyl-1,2-dihydro-pyrazol-3- ylideneamino) phenol (H2A) with some metal ions chelates have been determined potentiometrically using 0.1 M KCl and 20 % (v/v) ethanol-water mixture. The stability constants of the formed complexes were found to be in the order Re5+ > Ce3+ > Pd2+ >Th4+ > Hg2+ > Co2+. The dissociation constants (pKa) of H2A and the stability constants (log Ki) of their complexes were determined at 298, 308 and 318 K. The corresponding thermodynamic parameters (ΔG, ΔH and ΔS) were calculated and discussed. The results indicated that, the dissociation process is non-spontaneous, endothermic and entropically unfavorable. The formation of the metal complexes has been found to be endothermic and entropically favorable

Item Type: Article
Uncontrolled Keywords: Schiff-base derivative, dissociation and stability constants, thermodynamics.
Subjects: Q Science > Q Science (General)
Faculty/Division: Faculty of Industrial Sciences And Technology
Depositing User: Mrs. Neng Sury Sulaiman
Date Deposited: 13 May 2015 04:12
Last Modified: 25 Aug 2016 04:09
URI: http://umpir.ump.edu.my/id/eprint/9144
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