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A 3-D supramolecular framework, [Er(pybz)2(Hnds)(H2O)2]·H2O (1, Hpybz = 4- pyridin-4-yl-benzoic acid, H2nds = naphthalene-1,5-disulfonic acid), based on lanthanide ions and mixed ligands has been hydrothermally synthesized. The structure was determin