African Journal of
Pure and Applied Chemistry

  • Abbreviation: Afr. J. Pure Appl. Chem.
  • Language: English
  • ISSN: 1996-0840
  • DOI: 10.5897/AJPAC
  • Start Year: 2007
  • Published Articles: 368

Full Length Research Paper

Spectrophotometric and conductometric studies of the thermodynamics complexation of Zn2+, Cu2 +, Co2 +, Ni+2 and Cd2+ ions with a new schiff base ligand in acetonitrile solution

Mahmood Payehghadr1*, Ali Akbar Babaei2, Lotfali Saghatforoush3 and Fraydoun Ashrafi2
  aDepartment of Chemistry, Payame Noor University (PNU), Karaj, Iran. bDepartment of Chemistry, Payame Noor University (PNU), Sari, Iran. cDepartment of Chemistry, Payame Noor University (PNU), Khoy, Iran.
Email: [email protected]

  •  Accepted: 23 April 2009
  •  Published: 31 May 2009

Abstract

 

The complex-formation reactions between Cu2+, Zn2+, Co2+, Ni2+ and Cd2+ ions with 2-[(E)-(2-(2-(pyridine-2-yl)-ethylthio)ethylimino)methyl]-4-bromophenol(PYTABr) has been studied by spectrophotometric and conductometric methods in acetonitrile at various temperatures. Formation constants of the 1:1 and 1:2 (metal ion to ligand) complexes were evaluated from computer fitting of the absorbance-mole ratio data, and molar conductance-mole ratio data at different temperatures, and found that complexes to vary in the order of Ni2+>Co2+>Cu2+>Zn2+>Cd2+. The enthalpy and entropy changes of the complexation reaction were determined from the temperature dependence of the formation constants.

 

Key words: Conductometric, spectrophotometric, formation constants, schiff bases, complexation.

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