Three New Iron(II) Thiocyanato Coordination Polymers Based on 4,4′-Bipyridine as Ligand and the Influence of Methanol on Their Structures

Poly[tris-(μ-4,4'-bi-pyridine-κ(2) N:N')bis(dimethyl sulfoxide-κO)tetra-kis-(thiocyanato-κN)dicobalt(II)]

The asymmetric unit of the title compound, [Co₂(NCS)₄(C₁₀H₈N₂)₃(C₂H₆OS)₂]_n, consists of one Co^II 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 Co^II 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.