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

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.