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)

Abstract

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 FeII 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.

Keywords

• crystal structure
• x-ray crystallography
• non-heme iron catalysts