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In the crystal structure of the title compound, [Ni(NCS) 2 (H 2 O) 4 ]·4C 6 H 8 N 2 , the Ni II  cations are coordinated by four water ligands and two  trans -coordinated terminally  N -bonded thio­cyanate anions in a slightly distorted octa­hedral geometry. The asymmetric unit consists of a Ni 2+  cation located on a centre of inversion, two water mol­ecules and one thio­cyanate ligand, as well as two uncoordinated 2,5-di­methyl­pyrazine ligands in general positions. In the crystal, discrete complex mol­ecules are linked into a three-dimensional network by O—H⋯N hydrogen bonding between the water H atoms and the 2,5-di­methyl­pyrazine N atoms.

Crystal structure of tetraaquabis(thiocyanato-κN)nickel(II)–2,5-dimethylpyrazine (1/4)