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The polymeric title complex, [Co(C 8 H 8 O 5 )(H 2 O) 2 ]  n   was synthesized by reaction of cobalt acetate with 7-oxabicyclo­[2,2,1]heptane-2,3-dicarb­oxy­lic anhydride. The Co II  ion is six-coordinated in a distorted octa­hedral environment, binding to two water O atoms, to the ether O atom of the bicyclo­heptane unit, to two carboxyl­ate O atoms from two different carboxyl­ate groups of the same anion and to one carboxyl­ate O atom from a symmetry-related anion. The bridging character of the dianion leads to the formation of ribbons along [001]. The ribbons are linked into a layered network parallel to (010) by several O—H⋯O hydrogen-bonding inter­actions involving the coordinating water mol­ecules as donors and the carboxyl­ate O atoms of neighbouring ribbons as acceptors. The crystal under investigation was an inversion twin.

acta crystallographica. section e

catena-Poly[[diaquacobalt(II)]-μ2-7-oxabicyclo[2.2.1]heptane-2,3-dicarboxylato-κ4O2,O3,O7:O2′]