title: Dinitrogen activation upon reduction of a triiron(II) complex.
abstract: Reaction of a trinuclear iron(II) complex, Fe3 Br3 L (1), with KC8 under N2 leads to dinitrogen activation products (2) from which Fe3 (NH)3 L (2-1; L is a cyclophane bridged by three β-diketiminate arms) was characterized by X-ray crystallography. (1) H NMR spectra of the protonolysis product of 2 synthesized under (14) N2 and (15) N2 confirm atmospheric N2 reduction, and ammonia is detected by the indophenol assay (yield ∼30 %). IR and Mössbauer spectroscopy, and elemental analysis on 2 and 2-1 as well as the tri(amido)triiron(II) 3 and tri(methoxo)triiron 4 congeners support our assignment of the reduction product as containing protonated N-atom bridges.
authors.affiliation: Center for Catalysis, Department of Chemistry, University of Florida, Gainesville, FL 32611-7200 (USA).
authors.forename: Yousoon
authors.initials: Y
authors.lastname: Lee
authors.forename: Forrest T
authors.initials: FT
authors.lastname: Sloane
authors.forename: Geneviève
authors.initials: G
authors.lastname: Blondin
authors.forename: Khalil A
authors.initials: KA
authors.lastname: Abboud
authors.forename: Ricardo
authors.initials: R
authors.lastname: García-Serres
authors.forename: Leslie J
authors.initials: LJ
authors.lastname: Murray
keywords: cyclophanes; dinitrogen activation; iron clusters; macrobicycles; redox cooperativity