The Association, Formation Constants and Gibbs Energies of Solvation for CoCl2 Stoichiometric Complexes with (E)-1-phenyl-2-(2-(4-((E)-phenyldiazenyl))phenyl hydrazono)-2-(phenylsulfonyl)ethanone at Different Temperatures

the association constants, formation constants and Gibbs free energies of solvation are calculated from the conductometric titration curves of CoCl2 with (E)-1-phenyl-2-(2-(4-((E)-phenyldiazenyl)phenyl)hydrazono)-2- (phenylsulfonyl) ethanone (L) in absolute ethanol at 293.15, 298.15, 303.15 and 308.15 K. On drawing the relation between molar conductance and the ratio of metal to ligand concentrations, different lines are obtained indicating the formation of 1: 2, 1:1 and 2:1 (M:L) stoichiometric complexes. The formation constants and Gibbs free energies of these different complexes in absolute ethanol at 293.15, 298.15, 303.15 and 308.15 K follow the order: Kf (2:1) > Kf (1:1) > Kf (1:2) for (M:L); and Gf (2:1) > Gf (1:1) > Gf (1:2) for (M:L).