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The asymmetric unit of the title compound, [Co2(NCS)4(C10H8N2)3(C2H6OS)2]n, consists of one CoII atom, two thio­cyanate anions, one dimethyl sulfoxide mol­ecule and one and a half 4,4′-bi­pyridine mol­ecules. The half-molecule is completed by inversion symmetry. The CoII atom is coordin­ated in a distorted octa­hedral geometry by two N atoms from two thio­cyanate anions, one O atom from dimethyl sulfoxide as a terminal ligand and three N atoms from three 4,4′-bi­pyridine mol­ecules as bridging ligands linking the cations, with a Co...Co separation of 11.5964 (5) Å. This generates a two-dimensional structure parallel to (-103). A C—H...S hydrogen bond links the layers into a three-dimensional supra­molecular framework. The layers are stacked in an ABC fashion preventing the occurrence of inter­layer void space and hence leading to the absence of lattice solvent and/or organic guest mol­ecules in the structure.
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