Thermodynamic studies on the functionalized substituted dioxotetraamine macrocyclic super-molecular metal complexes in the solution

New C-functionalized dioxotetraamine macrocycles, which contained two indep endent chelating groups, were synthesized and characterized. At (25.0 +/- 0 .1) degreesC, I=0.1 mol/L NaNO3, the thermodynamic properties of such supra molecular coordination compounds formed by the ligand with metal ions in aq ueous solution were studied by pH titrations and structures of coordination species were also suggested.