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Three polymeric erbium(Ⅲ) complexes [Er(oba) (Hoba) (H2O)2]H2O(A), [Er2(oba)3(H2O)4] (B),[Era(oba)3(2,2'-bpy)2] (C) (Haoba=4,4'-oxybis(benzoic acid), 2,2'-bpy = 2,2'-bipyridine)were hydrothermalty synthestzeo Dy altering the metal/carboxyl