Stepwise formation constants of some transition metal-chelates with cyclic tridentate amine

The Proton-ligand formation constant of 1, 4, 7-triaza cycloronane hydrochloride [[H3[9] ane N3]3+, 3Cl]and the stability constants of its chelates with Mn [II], Fe [II], Fe [III] Co [II], Co [III] and Cu [II] have been determined pH-metrically in aqueous solution in the presence of 0.1 M NaNO3 at 20-32 degree. The mole fraction of different species were calculated and discussed. The thermodynamic parameters for the mono complexes under investigation were also evaluated