Cu-X-bpy (X = Cl, Br; bpy = 4,4‘-bipyridine) Coordination Polymers: The Stoichiometric Control and Structural Relations of [Cu2X2(bpy)] and [CuBr(bpy)]

By controlling stoichiometry, three Copper(I) containing coordination polymers [Cu2Cl2(bpy)] (I), [Cu2Br2(bpy)] (II), and [CuBr(bpy)] (III) (bpy = 4,4‘-bipyridine) have been synthesized in superheated water at 170 °C. The crystal structures of I and II are two-dimensional networks composed of Cu2X2 double chains bridged by 4,4‘-bpy molecules through the nitrogen sites. The structure of III is a three-dimensional interpenetrating network constructed by concatenated 2D sheets. TGA studies indicate that these compounds are thermally stable up to 220 °C.