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The complexive ability of p-sulphonato-calix[4]arene towards dioxovanadium(V) and dioxouranium(VI) has been evaluated in acidic aqueous solution (pH 2) using UV–Vis spectrophotometric technique. The results showed that the ligand is capable to complex with the oxo-cations by 1:1 cation to ligand ratios. Formation constants of both systems have been determined at different temperatures (25 to 45°C)...