The asymmetric unit of the title compound, {[Co(CHO)(HO)]·2CHNO} or {[Co(Hdondc)(HO)]·2DMF} , comprises half of a Co ion, half of a 1,5-di-hydroxy-naphthalene-2,6-di-carboxyl-ate dianion (Hdondc), two water mol-ecules and a di-methyl-formamide (DMF) mol-ecule. The Co ion, which is located on a crystallographic inversion center, exhibits a distorted six-coord-inated octa-hedral geometry with two oxygen atoms of the Hdondc ligand and four oxygen atoms of the water mol-ecules. The carboxyl-ate group is almost coplanar with the naphthalene moiety and shows monodentate coordination to the Co ion. The Co ions are bridged by the Hdondc ligand to form a one-dimensional chain. The hy-droxy groups of the ligand have intra-chain hydrogen bonding inter-actions with coordinated water mol-ecules. The coordinated water mol-ecules exhibit not only intra-chain hydrogen bonding inter-actions, but also inter-chain hydrogen-bonding inter-actions. The chains are connected by inter-chain hydrogen-bonding inter-actions and are arranged in parallel to form a two-dimensional network. The chains are further connected by inter-chain hydrogen-bonding inter-actions the DMF mol-ecules and C-H⋯π inter-actions to give a three-dimensional network.
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