catena-Poly[[cobalt(II)-μ-aqua-di-μ-butano­ato-κ(2) O:O′;κ(2) O:O] 0.7-hydrate]

In the title coordination polymer, {[Co(C(3)H(7)COO)(2)(H(2)O)]·0.7H(2)O}(n), the Co(2+) cation is coordinated by four bridging butano­ate anions and two bridging water mol­ecules in a severely distorted octa­hedral geometry. The Co(2+) cations are linked by means of bridging ligands into polymeric chains along [010]. These chains are further connected to each other through hydrogen bonds involving partially occupied disordered water mol­ecules; thus, sheets parallel to (001) are formed. One of the positions of disordered water O atom lies on a twofold axis. Two atoms of the aliphatic chain of one of the butanoate anions are disordered over two positions each.