Synthesis, Structure and Luminescence Property of Cadmium(II) Coordination Polymer with Mixed 5-(Oxidediphenylphosphino)isophthalic Acid and 4,4′-Bipyridine Ligands

A new metal–organic framework {[Cd(L)(4,4′-bpy)]2·5H2O}n (1) had been synthesized by hydrothermal reaction of 5-(oxidediphenylphosphino)isophthalic acid, Cd(II) nitrate, NaOH and 4,4′-bipyridine (4,4′-bpy) as co-ligand. The novel compound was characterized by single crystal X-ray diffractometry as well as FTIR spectrum. Adjacent eight-member (C2Cd2O4) rings are connected each other through pairs of L2− ligands to result in a 1D double chain. Such ribbons are interconnected together by 4,4′-bpy to generate a 2D pillared layer, which are further held together by rich O–H···O hydrogen bonds to give a 3D supramolecular network. Solvent water molecules play an important role to bridge adjacent layers to form a 3D supramolecular architecture. The luminescence property and thermogravimetric analysis of title complex were investigated.