title: Syntheses, crystal structures, reactivity, and photochemistry of gold(III) bromides bearing N-heterocyclic carbenes.
abstract: Gold(I) complexes bearing N-heterocyclic carbenes (NHC) of the type (NHC)AuBr (3a/3b) [NHC = 1-methyl-3-benzylimidazol-2-ylidene (= MeBnIm), and 1,3-dibenzylimidazol-2-ylidene (= Bn(2)Im)] are prepared by transmetallation reactions of (tht)AuBr (tht = tetrahydrothiophene) and (NHC)AgBr (2a/2b). The homoleptic, ionic complexes [(NHC)(2)Au]Br (6a/6b) are synthesized by the reaction with free carbene. Successive oxidation of 3a/3b and 6a/6b with bromine gave the respective (NHC)AuBr(3) (4a/4b) and [(NHC)(2)AuBr(2)]Br (7a/7b) in good overall yields as yellow powders. All complexes were characterized by NMR spectroscopy, mass spectrometry, elemental analysis and single crystal X-ray diffraction. Reactions of the Au(III) complexes towards anionic ligands like carboxylates, phenolates and thiophenolates were investigated and result in a complete or partial reduction to a Au(I) complex. Irradiation of the Au(III) complexes with UV light yield the Au(I) congeners in a clean photo-reaction.
authors: Institut für Anorganische Chemie, Johannes Kepler Universität Linz, Austria.
authors: Christa
authors: C
authors: Hirtenlehner
authors: Charlotte
authors: C
authors: Krims
authors: Johanna
authors: J
authors: Hölbling
authors: Manuela
authors: M
authors: List
authors: Manfred
authors: M
authors: Zabel
authors: Michel
authors: M
authors: Fleck
authors: Raphael J F
authors: RJ
authors: Berger
authors: Wolfgang
authors: W
authors: Schoefberger
authors: Uwe
authors: U
authors: Monkowius
mesh_terms: D001965:Bromides / Q000737:chemistry*; D056831:Coordination Complexes / Q000138:chemical synthesis* / Q000737:chemistry; D018360:Crystallography, X-Ray; D006046:Gold / Q000737:chemistry*; D006571:Heterocyclic Compounds / Q000737:chemistry*; D008697:Methane / Q000031:analogs & derivatives* / Q000737:chemistry; D008958:Models, Molecular; D015394:Molecular Structure; D010777:Photochemistry; D013237:Stereoisomerism
chemical_list: D001965:Bromides; D056831:Coordination Complexes; D006571:Heterocyclic Compounds; C030011:carbene; D006046:Gold; D008697:Methane