Russian Journal of Inorganic Chemistry

, Volume 52, Issue 4, pp 640–644

Thermodynamic characteristics of metal complexation with 3-[4-iodophenylazo]-2,4-pentanedione in an aqueous ethanol solution

  • S. R. Gadzhieva
  • F. G. Pashaev
  • F. M. Chyragov
  • A. G. Gasanov
  • K. T. Makhmudov
Physical Chemistry of Solutions

Abstract

Complexation of metals with 3-[4-iodophenylazo]-2,4-pentanedione (L) in an aqueous ethanol solution at temperatures 298 ± 0.5, 318 ± 0.5, and 318 ± 0.5 K has been studied by the potentiometric titration method. The standard thermodynamic functions of the complexation reaction have been found. They change in the following sequence:
$$\begin{gathered} \left| {\Delta G^0 } \right|:Fe > Cu > Ni > Co > Mn > UO_2 > Zn > Cd > Mg > Ca, \hfill \\ \left| {\Delta H^0 } \right|:Fe > Cu > UO_2 > Ni > Co > Zn > Cd > Mn > Mg > Ca, \hfill \\ \Delta S^0 :Ca > Mn > Mg > Cd > Co > Ni > Zn > Fe > Cu > UO_2 . \hfill \\ \end{gathered} $$
The effective charges of atoms in the tautomeric forms of L (enol azo, keto azo, hydrazo) have been calculated by the LCAO MO method in the Hückel approximation.

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Copyright information

© Pleiades Publishing, Inc. 2007

Authors and Affiliations

  • S. R. Gadzhieva
    • 1
  • F. G. Pashaev
    • 1
  • F. M. Chyragov
    • 1
  • A. G. Gasanov
    • 1
  • K. T. Makhmudov
    • 1
  1. 1.Baku State UniversityBakuAzerbaijan

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