Crystal structure of catena-poly[[[di­aqua­cobalt(II)]-bis­(μ-hex-3-enedi­nitrile-κ(2) N:N′)] bis­(tetra­fluorido­borate)]

In the structure of the title salt, [Co(C(6)H(6)N(2))(2)(H(2)O)(2)](BF(4))(2), the Co(II) atom is located on an inversion centre. The transition metal is in a slightly distorted octa­hedral coordination environment, defined by the cyano N atoms of four hex-3-enedi­nitrile ligands in equatorial positions and the O atoms of two water mol­ecules in axial positions. The bridging mode of the hex-3-enedi­nitrile ligands leads to the formation of cationic chains extending parallel to [1-10]. The BF(4) (−) counter-anion is disordered over two sets of sites [occupancy ratio = 0.512 (19):0.489 (19)]. It is located in the voids between the cationic chains and is connected to the aqua ligands of the latter through O—H⋯F hydrogen bonds. One methyl­ene H atom of the hex-3-enedi­nitrile ligand forms another and weak C—H⋯O hydrogen bond with a water O atom of a neighbouring chain, thus consolidating the three-dimensional network structure.