Novel topological nets of lanthanide metal-organic frameworks based on dicarboxylate ligands

Four novel topological nets of lanthanide metal-organic frameworks: [Sm2(op)3(H2O)]n (1), {Ln2(op)2(ox)(H2O)4] · H2O}n (Ln = La, 2; Sm, 3), {[La2(mp)2(ox)(H2O)4] · 2H2O}n (4), [La2(op)2(mp)(H2O)4]n (5) (op = o-phthalate, mp = m-phthalate, and ox = oxalate), have been hydrothermally synthesized and characterized. Compound 1 exhibits novel (3,4,5,6)-connected five-nodal two-dimensional net, compound 2 and 3 show the (3,4)-connected V2O5 topologies, compound 4 has the (4,5)-connected topological net, and compound 5 shows the (4,5)-connected four-nodal three-dimensional network. Photoluminescent analyses of 1 and 3 show strong blue emission in the solid state at room temperature.