Jornal de termodinâmica e catálise
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Abstrato

Spectro-Potentiality and Thermodynamic Studies on Schiff Base Hydrazone Derivatives Complexes with Some Transition Elements

El Batouti M, El Mossalamya EH , Nawmosyc G

A new hydration Schiff base consisting of 7-chloro-4-(o-hydroxy benzilidenehydrazo) quinoline, with metal complexes of some divalent metal ions, Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II), and Cd(II) complexes were studies. Spectrophotometrically obeyed Beer's law up to certain values, 6.6×103, 8.0×103dm3mol-1cm-1, respectively, indicating that the ligand HL could be used to detect Co(II) and Ni(II) in such concentrations, the study was performed also for Fe (III)-complexes. Conductance and thermodynamically used molar ratio method to determine the stoichiometry of the complexes obtained confirmed the formation of 1:1 and 1:2, M:L complexes. The standard thermodynamic parameters viz. ΔG, ΔH and ΔS, for the proton-legend and the stepwise metal-ligand complexes eluated were analyzed in terms of the electrostatic (eel) and non-electrostatic (crates, c) components. ΔHc was found to be linearly correlated with the acceptor number of the metal ion (ANM), and ΔH el was linearly correlated with the ionic radii of the metal ion. The calculated values for ΔG°, ΔH° and ΔS° concluded that the complexion process processed spontaneously.