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 Huckel approximation.
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