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The thermodynamics of complexation and thermal properties of mixed ionic complexes of the types M(H2L)X2 and M(HL)X (where M = Fe(II), Fe(III),Co(III), Ni(II), and Cu(II)., L = bis(2,2 -methylylidenephenol) diaminoethane, and X = anions of the types Cl, NO3 , SO4 , ClO4 or OH) prepared using extractive method have been investigated. Thermal decomposition of the transition metal complexes took place in two or three distinct steps in exothermic reaction up to 800°C. The heat capacity change ( ), transition midpoint temperature (Tm), entropy change ( ), calorimetric enthalpy , Gibbs free energy change ( ), denaturation enthalpy ( )) and denaturation entropy ( ) were calculated from the results of differential scanning calorimetry (DSC) while Vant Hoff thermodynamic properties was used to calculate the stability constants of the complexes in solution. It was found that the stability constants of the complexes follow the order Fe(II) > Fe (III) > Cu(II) > Ni(II) > Co(II) while the denaturation enthalpy and entropy of the complexes follow the order Ni(II) > Fe(II) > Fe(III) > Co(II) > Cu(II) respectively.

Spectral and thermal analysis study of some transition metal complexes derived from bis(2,2/-methylylidene phenol)diaminoethane