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Acta Cryst. (2009). E65, m1530 [ doi:10.1107/S1600536809046108 ]
Abstract: 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 NiII 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 NiII 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.
Online 7 November 2009
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