A new two-dimensional cadmium metal–organic framework: poly[bis­(4,7-di­phenyl-1,10-phen­an­thro­line)(μ₃-5-nitro­isophthalato)cadmium(II)]

In the title cadmium metal–organic framework complex, [Cd(C₈H₃NO₆)(C₂₄H₁₆N₂)]_n or [Cd(NIPH)(dpphen)] (NIPH is nitro­isophthalate and dpphen is 4,7-diphenyl-1,10-phenanthroline), the unique Cd^II cation in a general position is coordinated by four carb­oxy O atoms from three symmetry-related NIPH anions and two N atoms from a dpphen ligand. The Cd^II cations are bridged by pairs of NIPH anions to generate a dinuclear mol­ecular building block, [Cd₂N₄(CO₂R)₄], with a Cd...Cd separation of 4.0936 (10) Å. Each such building block is connected to four adjacent dinuclear building blocks by NIPH anions, resulting in a two-dimensional layer framework in the bc plane. The dpphen ligands occupy the space between these layers and are linked by π–π inter­actions, with a separation of 3.4541 (6) Å between the central aromatic rings of inversion-related dpphen ligands. The thermogravimetric and photoluminescent properties of the complex have also been investigated.