title: Conversion of Fe-NH2 to Fe-N2 with release of NH3.
abstract: Tris(phosphine)borane ligated Fe(I) centers featuring N(2)H(4), NH(3), NH(2), and OH ligands are described. Conversion of Fe-NH(2) to Fe-NH(3)(+) by the addition of acid, and subsequent reductive release of NH(3) to generate Fe-N(2), is demonstrated. This sequence models the final steps of proposed Fe-mediated nitrogen fixation pathways. The five-coordinate trigonal bipyramidal complexes described are unusual in that they adopt S = 3/2 ground states and are prepared from a four-coordinate, S = 3/2 trigonal pyramidal precursor.
authors.affiliation: Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.
authors.forename: John S
authors.initials: JS
authors.lastname: Anderson
authors.forename: Marc-Etienne
authors.initials: ME
authors.lastname: Moret
authors.forename: Jonas C
authors.initials: JC
authors.lastname: Peters
mesh_terms: D000641:Ammonia / Q000737:chemistry*; D001880:Boranes / Q000737:chemistry*; D056831:Coordination Complexes / Q000737:chemistry*; D018360:Crystallography, X-Ray; D008024:Ligands; D008958:Models, Molecular; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*
chemical_list: D001880:Boranes; D056831:Coordination Complexes; D008024:Ligands; D000644:Quaternary Ammonium Compounds; D000641:Ammonia