title: Rhodium, iridium and nickel complexes with a 1,3,5-triphenylbenzene tris-MIC ligand. Study of the electronic properties and catalytic activities.
abstract: The coordination versatility of a 1,3,5-triphenylbenzene-tris-mesoionic carbene ligand is illustrated by the preparation of complexes with three different metals: rhodium, iridium and nickel. The rhodium and iridium complexes contained the [MCl(COD)] fragments, while the nickel compound contained [NiCpCl]. The preparation of the tris-MIC (MIC = mesoionic carbene) complex with three [IrCl(CO)2] fragments, allowed the estimation of the Tolman electronic parameter (TEP) for the ligand, which was compared with the TEP value for a related 1,3,5-triphenylbenzene-tris-NHC ligand. The electronic properties of the tris-MIC ligand were studied by cyclic voltammetry measurements. In all cases, the tris-MIC ligand showed a stronger electron-donating character than the corresponding NHC-based ligands. The catalytic activity of the tri-rhodium complex was tested in the addition reaction of arylboronic acids to α,β-unsaturated ketones.
authors.affiliation: Instituto de Materiales Avanzados (INAM), Universitat Jaume I, Avda. Vicente Sos Baynat, Castellón, 12071, Spain.
authors.forename: Carmen
authors.initials: C
authors.lastname: Mejuto
authors.affiliation: Instituto de Tecnologia Química e Biologica da Universidade Nova de Lisboa, Av. da República, EAN, Oeiras, 2780-157, Portugal.
authors.forename: Beatriz
authors.initials: B
authors.lastname: Royo
authors.affiliation: Instituto de Materiales Avanzados (INAM), Universitat Jaume I, Avda. Vicente Sos Baynat, Castellón, 12071, Spain.
authors.forename: Gregorio
authors.initials: G
authors.lastname: Guisado-Barrios
authors.affiliation: Instituto de Materiales Avanzados (INAM), Universitat Jaume I, Avda. Vicente Sos Baynat, Castellón, 12071, Spain.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Peris
keywords: arylation of unsaturated ketones; iridium; mesoionic carbenes; nickel; rhodium