Aqua­[1-(pyrazin-2-yl)ethanone oximato-κ(2) N,N′][1-(pyrazin-2-yl)ethanone oxime-κ(2) N,N′](thio­cyanato-κN)nickel(II)

In the title complex, [Ni(C(6)H(6)N(3)O)(NCS)(C(6)H(7)N(3)O)(H(2)O)] or [Ni(mpko)(SCN)(mpkoH)(H(2)O)] [where mpkoH = 1-(pyrazin-2-yl)ethanone oxime], the Ni(II) cation is in a slightly distorted octa­hedral geometry, being coordinated in the equatorial plane by four N atoms from two different mpkoH ligands, one of which is deprotonated, and by one N atom from a thio­cyanate anion and one O atom from a water mol­ecule in the axial positions. There is an intra­molecular O—H⋯O hydrogen bond involving the oxime units of the two ligands. In the crystal, a three-dimensional supra­molecular architecture is formed by O—H⋯O and O—H⋯N hydrogen bonds.