Syntheses and crystal structures of (R,R)- and (S,S)-bis­­(aceto­nitrile-κN)[N,N′-di­methyl-N,N′-bis­(pyridin-2-ylmeth­yl)cyclo­hexane-1,2-di­amine-κ4N]iron(II) bis­­(hexa­fluoro­anti­monate).

Two enanti­omeric non-heme iron complexes [Fe(R,R-BPMCN)(CH₃CN)₂](SbF₆)₂ and [Fe(S,S-BPMCN)(CH₃CN)₂](SbF₆)₂ (BPMCM = N,N′-dimethyl-N,N′-bis­(pyridin-2-ylmeth­yl)-cyclo­hexane-1,2-di­amine, C₂₂H₂₈N₄) were obtained in parallel syntheses starting from the enanti­omerically pure R,R and S,S BPMCN ligands. The Fe^II cations have a distorted octa­hedral FeN₆ geometry formed by a chelating N,N,N,N-tetra­dentate BPMCN ligand and two mol­ecules of aceto­nitrile. The ligand adopts a cis-α topology with the two pyridine groups coordinated trans to each other. In the crystals, a system of C—H⋯F hydrogen bonds links the cations to the hexa­fluoro­anti­monate anions, resulting in a three-dimensional architecture. [ABSTRACT FROM AUTHOR]