Bis(tripyrazol-1-ylmethane)nickel(II) tetra­cyanidonickelate(II) dihydrate

摘要

The title complex, [Ni(C10H10N6)2][Ni(CN)4]·2H2O, contains an octa­hedral 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 mol­ecules into extended chains that run parallel to the a axis.