title: catena-Poly[[diaqua-cobalt(II)]-μ(2)-7-oxa-bicyclo-[2.2.1]heptane-2,3-dicarboxyl-ato-κO,O,O:O].
abstract: 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-dicarb-oxy-lic anhydride. The Co(II) ion is six-coordinated in a distorted octa-hedral environment, binding to two water O atoms, to the ether O atom of the bicyclo-heptane unit, to two carboxyl-ate O atoms from two different carboxyl-ate groups of the same anion and to one carboxyl-ate 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 inter-actions involving the coordinating water mol-ecules as donors and the carboxyl-ate O atoms of neighbouring ribbons as acceptors. The crystal under investigation was an inversion twin.
authors.forename: Fan
authors.initials: F
authors.lastname: Zhang
authors.forename: Qiu-Yue
authors.initials: QY
authors.lastname: Lin
authors.forename: Yong-Chang
authors.initials: YC
authors.lastname: Wang
authors.forename: Ji-Du
authors.initials: JD
authors.lastname: He