Abstract
The title compound, [Ni(2)(C(8)H(6)N(3))(2)(C(2)H(3)O(2))(2)(C(5)H(8)N(2))(2)] or [Ni(μ-OOCCH(3))(2-PyPz)(Me(2)PzH)](2) (1) [2-PyPz = 3-(pyridin-2-yl) pyrazole; Me(2)PzH = 3,5-dimethyl pyrazole] was synthesized from Ni(OOCCH(3))(2)·4H(2)O, 2-PyPzH, Me(2)PzH and tri-ethyl-amine as a base. Compound 1 {[Ni(2)(C(30)H(34)N(10)Ni(2)O(4))]} at 100 K has monoclinic (P2(1)/n) symmetry and the mol-ecules have crystallographic inversion symmetry. Mol-ecules of 1 comprise an almost planar dinuclear Ni(II) core with an N(4)O(2) coordination environment. The equatorial plane consists of N(3),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 Me(2)PzH 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 1 exhibits various inter- and intra-molecular C-H⋯O and N-H⋯O hydrogen bonds.