In the title coordination polymer, {[Co(C3H7COO)2(H2O)]·0.7H2O}n, the Co2+ cation is coordinated by four bridging butanoate anions and two bridging water molecules in a severely distorted octahedral geometry. The Co2+ 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.
The title compound, {[Co(C2H5COO)2(H2O)]·H2O}n, was synthesized by the reaction of cobalt(II) carbonate hydrate with aqueous propionic acid. The structure consists of polymeric infinite linear chains with composition [Co(C2H5COO)4/2(H2O)2/2]∞ running along [010]. The chains are formed by Co2+ ions linked with bridging propionate groups and water molecules, with a Co⋯Co distance along the chains of 3.2587 (9) Å. The Co2+ ion is six-coordinated in a strongly distorted octahedral geometry. The chains are connected to each other by a network of O—H⋯O hydrogen bonds involving solvent water molecules.
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