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In the structure of the title salt, [Co(C6H6N2)2(H2O)2](BF4)2, the Co(II) atom is located on an inversion centre. The transition metal is in a slightly distorted octa-hedral coordination environment, defined by the cyano N atoms of four hex-3-enedi-nitrile ligands in equatorial positions and the O atoms of two water mol-ecules in axial positions. The bridging mode of the hex-3-enedi-nitrile ligands leads to the formation of cationic chains extending parallel to [1-10]. The BF4 (-) 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 methyl-ene H atom of the hex-3-enedi-nitrile 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.

Crystal structure ofcatena-poly[[[diaquacobalt(II)]-bis(μ-hex-3-enedinitrile-κ2N:N′)] bis(tetrafluoridoborate)]

Crystal structure ofcatena-poly[[[diaquacobalt(II)]-bis(μ-hex-3-enedinitrile-κ²N:N′)] bis(tetrafluoridoborate)]