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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. Fouda EMAIL logo , A. Al-Sarawy and E. El-Katori
Published/Copyright: February 1, 2006
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Chemical Papers
From the journal Chemical Papers Volume 60 Issue 1

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+, UO22+, 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.

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Published Online: 2006-2-1
Published in Print: 2006-2-1

© 2006 Institute of Chemistry, Slovak Academy of Sciences

Articles in the same Issue

  1. Carbon dioxide production in the oscillating Belousov—Zhabotinsky reaction with oxalic acid
  2. Potentiometric and thermodynamic studies of 3-methyl-1-phenyl-{p-[N-(pyrimidin-2-yl)-sulfamoyl]phenylazo}-2-pyrazolin-5-one and its metal complexes
  3. Spectral and electrochemical study of coordination molecules Cu4OX6L4: 3-Methylpyridine and 4-Methylpyridine Cu4OBrnCl(6−n)L4 complexes
  4. Anodic stripping voltammetric determination of lead and cadmium in soil extracts
  5. Gold and silver determination in Waters by SPHERON® Thiol 1000 preconcentration and ETAAS
  6. Syntheses, geometry optimization, and electronic structure of N-and C-substituted benzonaphthyridines
  7. Synthesis, spectral description, and lipophilicity parameters determination of phenylcarbamic acid derivatives with integrated N-phenylpiperazine moiety in the structure
  8. New methods in synthesis of acetylcholinesterase reactivators and evaluation of their potency to reactivate cyclosarin-inhibited AChE
  9. Furan-containing thiacyanine analogs and their antimicrobial activity
  10. Synthesis and biological activity of new 1,3,4-thiadiazole derivatives
  11. Synthesis and identification of immunogen medroxyprogesterone acetate residues in edible foods and preparation of the Antisera
  12. Synthesis and characterization of oligosalicylaldehyde-based epoxy resins
  13. Extracellular polysaccharides produced by acapsular mutant of Cryptococcus laurentii
  14. Liquid chromatography of synthetic polymers under limiting conditions of insolubility. I. Principle of the method
  15. Transport velocities of different particulate materials in pneumatic conveying
  16. Nitrous oxide emissions from waste incineration
https://doi.org/10.2478/s11696-006-0002-3

Articles in the same Issue

  1. Carbon dioxide production in the oscillating Belousov—Zhabotinsky reaction with oxalic acid
  2. Potentiometric and thermodynamic studies of 3-methyl-1-phenyl-{p-[N-(pyrimidin-2-yl)-sulfamoyl]phenylazo}-2-pyrazolin-5-one and its metal complexes
  3. Spectral and electrochemical study of coordination molecules Cu4OX6L4: 3-Methylpyridine and 4-Methylpyridine Cu4OBrnCl(6−n)L4 complexes
  4. Anodic stripping voltammetric determination of lead and cadmium in soil extracts
  5. Gold and silver determination in Waters by SPHERON® Thiol 1000 preconcentration and ETAAS
  6. Syntheses, geometry optimization, and electronic structure of N-and C-substituted benzonaphthyridines
  7. Synthesis, spectral description, and lipophilicity parameters determination of phenylcarbamic acid derivatives with integrated N-phenylpiperazine moiety in the structure
  8. New methods in synthesis of acetylcholinesterase reactivators and evaluation of their potency to reactivate cyclosarin-inhibited AChE
  9. Furan-containing thiacyanine analogs and their antimicrobial activity
  10. Synthesis and biological activity of new 1,3,4-thiadiazole derivatives
  11. Synthesis and identification of immunogen medroxyprogesterone acetate residues in edible foods and preparation of the Antisera
  12. Synthesis and characterization of oligosalicylaldehyde-based epoxy resins
  13. Extracellular polysaccharides produced by acapsular mutant of Cryptococcus laurentii
  14. Liquid chromatography of synthetic polymers under limiting conditions of insolubility. I. Principle of the method
  15. Transport velocities of different particulate materials in pneumatic conveying
  16. Nitrous oxide emissions from waste incineration
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