Bis[μ-3-(pyridin-2-yl)pyrazolato]bis-[acetato-(3,5-dimethyl-1-pyrazole)-nickel(II)].

The title compound, [Ni(CHN)(CHO)(CHN)] or [Ni(-OOCCH)(2-PyPz)(MePzH)] () [2-PyPz = 3-(pyridin-2-yl) pyrazole; MePzH = 3,5-dimethyl pyrazole] was synthesized from Ni(OOCCH)·4HO, 2-PyPzH, MePzH and tri-ethyl-amine as a base. Compound {[Ni(CHNNiO)]} at 100 K has monoclinic (2/) symmetry and the mol-ecules have crystallographic inversion symmetry. Mol-ecules of comprise an almost planar dinuclear Ni core with an NO coordination environment. The equatorial plane consists of N,O coordination derived from one of the bidentate acetate O atoms and three of the N atoms of the chelating 2-PyPz ligand while the axial positions are occupied by neutral MePzH and the second O atom of the acetate unit. The Ni atoms are bridged by the nitro-gen atom of a deprotonated 2-PyPz ligand. Compound exhibits various inter- and intra-molecular C-H⋯O and N-H⋯O hydrogen bonds.