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Three lanthanum/4-sulfocalix[4]arene complexes,namely,H2[(H4CAS)La(H2O)7]2· H2[(H4CAS)La(H2O)7]2·2C2H5OH·12H2O(1),[H(H4CAS)La(H2O)5]·5H2O(2)and [(H4CAS)La-(H2O)4(NO3)La(H2O)5]·7H2O(3),have been synthesized at different pH conditio