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In the title compound, [Co(C4N3)2(C10H8N2O2)]·2H2O, a novel tricyano­methanide complex, the CoII atom is located on an inversion center and has a distorted octa­hedral coordination with two 2,2′-bipyridyl dioxide (dpdo) mol­ecules and two trans tricyano­methanide (tcm) anions. The equatorial plane is formed by the four O atoms of the two chelating dpdo ligands, with one N atom of each of the two tcm ligands occupying an apical position. There is a disordered solvent water mol­ecule in the asymmetric unit (occupancy ratio 0.63:0.37). These water mol­ecules result in the formation of O—H...O and O—H...N hydrogen bonds, building a layer parallel to (100). The layers are linked by C—H...N hydrogen-bonding inter­actions, leading to a three-dimensional network.
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