Infinite three-dimensional coordination polymers:: Synthesis and structures of [Cd (4,4′-bpy)2 (H2O)2]n (pic)2n, [Zn (4,4′-bpy)2 (H2O)2]n-(pic)2n (H2O)2n, and [Zn (4,4′-bpy)2 (H2O)2]n (4,4′-bpy)n (H2O)n (pic)2n

Three Complexes of the formula [ Cd (4.4'-bpy)(2) (H2O2) ](n) (pic)(2n) (1). [ Zn (4.4'-bpy)(2) (H2O)(2), ](n)-(pic)(2n) (H2O)(2n) (2) and [ Zn ( 4. 4'-bpy)(2) (H2O)(2) ](n) (4.4'-bpy)(n) (pic)(2n) (H2O)(n) (3) (4.4'-bpy = 4.4'.-bipyridine: pic = picric anion) have been synthesized and characterized by elemental analysis and single-crystal x-ray diffraction. They all have infinite three-dimensional network structure, crystallizing in the monoclinic space group C2/c (1)and Cc (2,3).