Syntheses and crystal structures of two metal succinates modified by bipyridines

Two new metal succinates modified by rigid bipyridines, Cd(4,4'-bpy)(C4H4O4).1/4H(2)O (1) and Cu(2,2'-bpy)(C4H4O4)(0.5)(NO3)(H2O) (2) (bpy = bipyridine), have been synthesized by hydrothermal reactions and structurally determined. Complex I crystallizes in the orthorhombic space group Cmca with the cell parameters a = 11.696(2) b = 15.554(2), c = 15.874(3) Angstrom, alpha = beta = gamma = 90.00degrees, V = 2888(3) Angstrom(3), Z = 8. Complex 2 crystallizes in the triclinic space group P (1) over bar with a = 7.077(1), b = 9.838(2), c = 10.461(2) Angstrom, alpha = 71.941(3)degrees, beta = 73.078(3)degrees, gamma = 74.502(3)degrees, V = 649.8(2) Angstrom(3) Z = 2. In complex 1, a 2-D network was formed by Cd-succinato bonding. The 2-D networks are pillared by 4,4'-bpy ligands, forming a 3-D grid framework. The 2-fold interpenetration of the resulting 3-D frameworks completes the molecular structure. In complex 2, the Cull atom adopts a distorted octahedral in which the Cull atoms are bridged by two H2O molecules into an infinite zigzag chain, [Cu-2(H2O)(2)(C4H4O4)]n. The neighboring chains are further linked by pi-pi stacking interactions into a 2-D network, and the interlayer hydrogen bonds lead to the final 3-D crystal structure.