Coordination polymers of cobalt(II): [Co(4,4′-bpy)2(O2CCF3)2]n and [Co(4,4′-bpy)(O2CCH3)2(H2O)2]n

Abstract

Two novel coordination polymers of cobalt(II) have been synthesized and characterized structurally. The first compound, [Co(4,4′-bpy)₂(O₂CCF₃)₂] (1), was obtained from the reaction of Co(O₂CCF₃)₂ with 4,4′-bipyridine. Compound 1 has a covalently linked, two-dimensional, fishing-net-like structure. The fishing nets of 1 stack in the lattice, allowing the formation of extended channels that host diethyl ether solvent molecules in the solid state. The second compound, [Co(4,4′-bpy)(O₂CCH₃)₂(H₂O)₂] (2), was obtained from the reaction of Co(CH₃CO₂)₂·4H₂O with 4,4′-bipyridine. Compound 2 has a covalently linked one-dimensional chain structure. In the crystal lattice of 2 the one-dimensional chains form an interpenetrating, three-dimensional structure via interchain hydrogen bonds between acetate and H₂O ligands. There are channels parallel to the b axis in the lattice of 2 that appear to host small guest molecules such as methanol and H₂O.