title: Bis(tripyrazol-1-ylmethane)nickel(II) tetra-cyanidonickelate(II) dihydrate.
abstract: The title complex, [Ni(C(10)H(10)N(6))(2)][Ni(CN)(4)]·2H(2)O, contains an octa-hedral nickel(II) cation and a square-planar nickel(II) anion. Both the cation and the anion reside on a crystallographic center of inversion. The Ni(II) center in the cation is coordinated by six pyrazol-1-yl rings of two chelating tripyrazol-1-ylmethane [HC(pz)(3)] ligands, with Ni-N distances that range between 2.0647 (19) and 2.0828 (19) Å. The Ni(II) center in the anion is coordinated by four cyanide ligands, with Ni-C distances in the range 1.869 (2)-1.869 (3) Å. The [Ni(CN)(4)](2-) anions are linked by inversion-related water mol-ecules into extended chains that run parallel to the a axis.
authors.forename: Ganna
authors.initials: G
authors.lastname: Lyubartseva
authors.forename: Sean
authors.initials: S
authors.lastname: Parkin