Crystal structure of an unknown solvate of bis-(tetra-n-butyl-ammonium) [N,N'-(4-tri-fluoro-methyl-1,2-phenyl-ene)bis-(oxamato)-κ(4) O,N,N',O']nickelate(II)

• Published in: Acta crystallographica. Section E, Crystallographic communications Vol. 71; no. Pt 6; pp. 578 - 581
• Main Authors: Eya'ane Meva, François, Schaarschmidt, Dieter, Rüffer, Tobias
• Format: Journal Article
• Language: English
• Published: England International Union of Crystallography 01.06.2015
• Subjects: crystal structure; disorder; nickel(II); non-symmetric compound; oxamate ligand; Research Communications; SQUEEZE procedure; non-symmetric compound; crystal structure; disorder; oxamate ligand; nickel(II); SQUEEZE procedure
• ISSN: 2056-9890; 2056-9890
• DOI: 10.1107/S205698901500835X

In the title compound, [N(C4H9)4]2[Ni(C11H3F3N2O6)] or [N(n-Bu)4]2[Ni(topbo)] [n-Bu = n-butyl and topbo = 4-tri-fluoro-methyl-1,2-phenyl-enebis(oxamate)], the Ni(2+) cation is coordinated by two deprotonated amido N atoms and two carboxyl-ate O atoms, setting up a slightly distorted square-planar coordination environment. The [Ni(topbo](2-) anion lies on a twofold rotation axis. Due to an incompatibility with the point-group symmetry of the complete mol-ecule, orientational disorder of the CF3 group is observed. The tetra-hedral ammonium cations and the anion are linked by weak inter-molecular C-H⋯O and C-H⋯F hydrogen-bonding inter-actions into a three-dimensional network. A region of electron density was treated with the SQUEEZE procedure in PLATON [Spek (2015). Acta Cryst. C71, 9-18] following unsuccessful attempts to model it as plausible solvent mol-ecule(s). The given chemical formula and other crystal data do not take into account the unknown solvent mol-ecule.