Received 26 August 2013
In the title salt, [Ni(C12H14N6O)2](CF3SO3)2·2H2O, the NiII cation is located on an inversion centre and is coordinated by six N atoms from two tridentate 1-methoxy-2,2,2-tris(pyrazol-1-yl)ethane ligands in a distorted octahedral geometry. The Ni-N distances range from 2.0594 (12) to 2.0664 (12) Å, intra-ligand N-Ni-N angles range from 84.59 (5) to 86.06 (5)°, and adjacent inter-ligand N-Ni-N angles range between 93.94 (5) and 95.41 (5)°. In the crystal, inversion-related pyrazole rings are - stacked, with an interplanar spacing of 3.4494 (18) Å, forming chains that propagate parallel to the a-axis direction. Intermolecular O-HO hydrogen bonds are present between water molecules and trifluoromethanesulfonate anions.
Pyrazole-based tridentate ligands are drawing more attention because of their topology and nature of donor atoms, see: Paulo et al. (2004); Bigmore et al. (2005). For the ligand synthesis, see: Maria et al. (2007). The compound reported here was prepared as part of our ongoing research effort to study nitrogen-donor tridentate scorpionate ligands coordinated to nickel, see: Lyubartseva et al. (2011, 2012); Lyubartseva & Parkin (2009).
Data collection: COLLECT (Nonius, 1998); cell refinement: SCALEPACK (Otwinowski & Minor, 1997); data reduction: DENZO-SMN (Otwinowski & Minor, 1997); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008b); program(s) used to refine structure: SHELXL2013 (Sheldrick, 2008b); molecular graphics: XP in SHELXTL (Sheldrick, 2008b); software used to prepare material for publication: SHELXL2013.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: TK5252 ).
GL gratefully acknowledges the Southern Arkansas University Faculty Research Grant for financial support.
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