Diaquabis(4,4′-bipyridine-κN)bis(4-carboxyphenoxyacetato-κO)cobalt(II) tetrahydrate

The crystal structure of the title complex, [Co(C9H7O5)(2)-(C10H8N2)(2)(H2O)(2)] (.) 4H(2)O or [Co(4-CPOAH)(2)(4,4'-bipy)(2)-(H2O)(2)] (.) 4H(2)O (4,4'-bipy is 4,4'-bipyridine and 4-CPOAH(-) is the 4-carboxyphenoxyacetate monoanion), consists of two independent mononuclear molecules that interact through the uncoordinated water molecules. The Co-II atoms lie on inversion centers and display an octahedral geometry defined by two oxyacetate O atoms of 4-CPOAH(-) groups, two N atoms of 4,4'-bipy ligands and two water molecules. A three-dimensional supramolecular network structure is formed through hydrogen-bonding interactions.