Syntheses and crystal structures of (R,R)- and (S,S)-bis-(aceto-nitrile-κN)[N,N'-dimethyl-N,N'-bis(pyridin-2-ylmeth-yl)cyclo-hexane-1,2-di-amine-κ(4) N]iron(II) bis-(hexa-fluoro-anti-monate).

Two enanti-omeric non-heme iron complexes [Fe(R,R-BPMCN)(CH(3)CN)(2)](SbF(6))(2) and [Fe(S,S-BPMCN)(CH(3)CN)(2)](SbF(6))(2) (BPMCM = N,N'-dimethyl-N,N'-bis-(pyridin-2-ylmeth-yl)-cyclo-hexane-1,2-di-amine, C(22)H(28)N(4)) were obtained in parallel syntheses starting from the enanti-omerically pure R,R and S,S BPMCN ligands. The Fe(II) cations have a distorted octa-hedral FeN(6) geometry formed by a chelating N,N,N,N-tetra-dentate BPMCN ligand and two mol-ecules of aceto-nitrile. 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 hexa-fluoro-anti-monate anions, resulting in a three-dimensional architecture.