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Potentiometric and thermodynamic studies of 3-methyl-1-phenyl-{p-[N-(pyrimidin-2-yl)-sulfamoyl]phenylazo}-2-pyrazolin-5-one and its metal complexes

A. S. Fouda, A. A. Al-Sarawy, and E. E. El-Katori

Department of Chemistry, Faculty of Science, Mansoura University, Mansoura, Egypt

 

E-mail: emad_992002@yahoo.com

Received: 22 October 2004  Revised: 15 July 2005  Accepted: 25 July 2005

Abstract: The dissociation constants of 3-methyl-1-phenyl-{p-[N-(pyrimidin-2-yl)sulfamoyl]phenylazo}-2-pyrazolin-5-one and metal-ligand stability constants of its complexes with some transition metal ions have been determined potentiometrically in 0.1 M-KCl and ethanol—water mixture (30 vol. %). The order of the stability constants of the formed complexes increases in the sequence Mn2+, Co2+, Ni2+, Cu2+, La3+, Hf3+, UO 2 2+ , Zr4+. The effect of temperature was studied and the corresponding thermodynamic parameters (ΔG, ΔH, and ΔS) were derived and discussed. The dissociation process is nonspontaneous, endothermic, and entropically unfavourable. The formation of the metal complexes was found to be spontaneous, exothermic, and entropically favourable. Abstracted from his M.Sc. Thesis.

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-006-0002-3

 

Chemical Papers 60 (1) 5–9 (2006)

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