Acta Crystallographica Section E
Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.009 Å; R factor = 0.056; wR factor = 0.150; data-to-parameter ratio = 13.8. The title crystal structure, [Ni 3 (C 19 H 24 N 2 O 2 ) 2 (CHO 2 ) 2 -(C 3 H 7 NO) 2 ], consists of discrete centrosymmetric homotrinuclear nickel complex molecules. In each molecule, the central Ni II ion is in a distorted octahedral coordination environment, formed by four O atoms from two chelating DML 2À ligands [DMLH 2 = N,N 0
... -bis(salicylidene)-2,2 0dimethyl-1,3-propanediamine] in the equatorial plane and two O atoms of two symmetry-related formate ligands in the axial positions. The terminal Ni II ions also have distorted octahedral coordination environments and these are formed by two O and N atoms from chelating DML 2À ligands in the equatorial plane; the axial positions are occupied by O atoms from a dimethylformamide ligand and a formate ligand. The overall result is three edge-shared octahedra in which the closest NiÁ Á ÁNi distance is 3.0857 (14) Å . The crystal structure is stabilized by weak C-HÁ Á ÁO hydrogen bonds (agnostic interactions).