title: Nucleophilic T-Shaped (LXL)Au(I)-Pincer Complexes: Protonation and Alkylation.
abstract: We report the synthesis and reactivity of unusual T-shaped (LXL)Au(I)-pincer complexes, based on a carbazole framework flanked by two mesoionic carbenes (MICs). In contrast to other Au(I) complexes, these complexes react with electrophiles. Protonation and alkylation occur either at the metal or the ligand, depending on steric factors. Of particular interest, protonation at gold leads to an unprecedented cationic Au(III) hydride, which gives a1H NMR resonance at δ -8.34 ppm. The reactivity of this "hydride", however, shows protic and not hydridic behavior.
authors.affiliation: Chemistry Department, University of Pretoria , Private Bag X20, Hatfield 0028, Pretoria, South Africa.
authors.forename: George
authors.initials: G
authors.lastname: Kleinhans
authors.affiliation: UCSD-CNRS Joint Research Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California, San Diego , La Jolla, California 92093-0358, United States.
authors.forename: Max M
authors.initials: MM
authors.lastname: Hansmann
authors.affiliation: Institute of Advance Materials (INAM), Universitat Jaume I , Avenida Vicente Sos Baynat s/n, 12071 Castellon, Spain.
authors.forename: Gregorio
authors.initials: G
authors.lastname: Guisado-Barrios
authors.affiliation: Chemistry Department, University of Pretoria , Private Bag X20, Hatfield 0028, Pretoria, South Africa.
authors.forename: David C
authors.initials: DC
authors.lastname: Liles
authors.affiliation: UCSD-CNRS Joint Research Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California, San Diego , La Jolla, California 92093-0358, United States.
authors.forename: Guy
authors.initials: G
authors.lastname: Bertrand
authors.affiliation: Chemistry Department, University of Pretoria , Private Bag X20, Hatfield 0028, Pretoria, South Africa.|Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand , Johannesburg 2050, South Africa.
authors.forename: Daniela I
authors.initials: DI
authors.lastname: Bezuidenhout