Syntheses and Crystal Structures of Two Metal Succinates Modified by Bipyridines

Two new metal succinates modified by rigid bipyridines, Cd(4, 4′‐bpy)(C 4 H 4 O 4 )·1/4H 2 O ( 1 ) and Cu(2, 2′‐bpy)(C 4 H 4 O 4 ) 0.5 (NO 3 )(H 2 O) ( 2 ) (bpy = bipyridine), have been synthesized by hydrothermal reactions and structurally determined. Complex 1 crystallizes in the orthorhombic space group C mca with the cell parameters a = 11.696(2), b = 15.554(2), c = 15.874(3) Å, α = β = γ = 90.00°, V = 2888(3) Å 3 , Z = 8. Complex 2 crystallizes in the triclinic space group $P{\bar 1}$ with a = 7.077(1), b = 9.838(2), c = 10.461(2) Å, α = 71.941(3)°, β = 73.078(3)°, γ = 74.502(3)°, V = 649.8(2) Å 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 Cu II atom adopts a distorted octahedral in which the Cu II atoms are bridged by two H 2 O molecules into an infinite zigzag chain, [Cu 2 (H 2 O) 2 (C 4 H 4 O 4 )] n . The neighboring chains are further linked by π‐π stacking interactions into a 2‐D network, and the interlayer hydrogen bonds lead to the final 3‐D crystal structure.