Two novel porous luminescent lanthanide-organic frameworks with new four-nodal (3,4)-connected network topology

Two new porous lanthanide-organic frameworks, {[Ln2(HIDC)3(H2O)2]·7H2O}n [Ln = Tb(1) and Eu(2), H3IDC = imidazole-4,5-dicarboxylic acid], were obtained under hydrothermal conditions. Both of them possess 3D frameworks containing 1D rectangle channels along a-axis. Topological analyses of two complexes reveal that they exhibit unusual 4-nodal (3,4)-connected network. Furthermore, their solid-state luminescent behaviors have been investigated at room temperature.