A new moisture-sensitive metal-coordination solids {[Cd(C4O4)(bipy)(H2O)2] · 3H2O}∞ (bipy=4,4′-bipyridine)

A new mixed-ligands metal-coordination polymer, [Cd(C4O4)(bipy)(H2O)2] (1), (bipy=4,4′-bipyridine), was synthesized under hydrothermal condition and characterized by X-ray diffraction method. A three-dimensional interpenetrating network with one-dimensional channels intercalating water molecules undergoes a reversible hydration-dehydration process upon a cooling-heating cycles associated with distinct color change and structural variation.