A Linear Trinuclear Ni^II–Mn^II–Ni^II Complex with a μ-Acetato Bridge: Bis{(μ-acetato)[μ-bis(salicylidene)-1,3-propanediaminato](N,N-dimethylformamide)nickel(II)}manganese(II)

The structure of the title compound, [Mn{Ni(C₂H₃O₂)(C₃H₇NO) (C₁₇H₁₆N₂O₂)}₂], consists of a linear heterotrinuclear unit with a central Mn^II ion. Both the terminal Ni^II ions and the central Mn^II ion have irregular octahedral coordinations. The central Mn^II ion is located on the inversion centre. Each pair of metal ions is triply bridged via O atoms from the N,N′-bis(salicylidene)-1,3-propanediaminato (SALPD²⁻) ligands and from the acetate groups. The coordination around the Mn^II ion consists of four O atoms from two SALPD²⁻ ligands, and one O atom from each of two acetate ligands. The coordination of each terminal Ni^II ion is provided by the two O and two N atoms from a SALPD²⁻ ligand, and by one O atom each from a bridging acetate and a dimethylformamide (dmf) ligand. The dmf and acetate ligands are trans about the terminal Ni^II ion. The average Ni—O and Ni—N distances for the terminal ions are 2.071 (2) and 2.026 (2) Å, respectively. The Ni...Mn distance is 3.133 (2) Å.

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