Cyclometalated gold(III) complexes : noticeable differences between (N,C) and (P,C) ligands in migratory insertion
Serra Parareda, Jordi (Universitat de Girona. Institut de Química Computacional i Catàlisi)
Font, Pau (Universitat de Girona. Institut de Química Computacional i Catàlisi)
Sosa Carrizo, E. Daiann (Université de Pau et des Pays de l'Adour. Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux)
Mallet Ladeira, Sonia (Institut de Chimie de Toulouse)
Massou, Stéphane (Institut de Chimie de Toulouse)
Parella Coll, Teodor (Universitat Autònoma de Barcelona. Servei de Ressonància Magnètica Nuclear)
Miqueu, Karinne (Université de Pau et des Pays de l'Adour. Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux)
Amgoune, Abderrahmane (Université Paul Sabatier. Laboratoire Hétérochimie Fondamentale Appliquée)
Ribas, Xavi (Universitat de Girona. Institut de Química Computacional i Catàlisi)
Bourissou, Didier (Université Paul Sabatier. Laboratoire Hétérochimie Fondamentale Appliquée)

Data:	2018
Resum:	Gold(III) complexes are garnering increasing interest for opto-electronic, therapeutic and catalytic applications. But so far, very little is known about the factors controlling their reactivity and the very influence of the ancillary ligand. This article reports the first comprehensive study on this topic. The reactivity of a cationic (N,C) gold(III) complex, namely 1A, towards ethylene has been thoroughly studied and comparedwith that of the related (P,C) complex 1C. A cationicgold(III) complex 5A resulting fromdouble insertion of ethylene was selectively obtained. Complex 5A was found to be remarkably stable. It was trapped with chloride and fully characterized. In marked contrast to that observed with 1C, no b-H elimination or linear-to-branched rearrangement of the alkyl chain occurred with 1A. The energy profile for the reactions of 1A with ethylene has been comprehensively investigated computationally, and the influence of the ancillary ligand has been precisely delineated. Because nitrogen is a weaker donor than carbon (and phosphorus), the (N,C) ligand is very electronically dissymmetric, much more than the (P,C) ligand. This makes the two reactive sites at gold quite different, which noticeably influences the competition between migratory insertion and b-H elimination, and actually changes the outcome of the olefin insertion at gold. This study provides valuable insight into the influence of ancillary ligands on gold(III) reactivity, something critical to further develop Au(III) and Au(I)/Au(III) catalysis.
Ajuts:	European Commission 277801 Ministerio de Economía y Competitividad CTQ2016-77989-P Ministerio de Economía y Competitividad CTQ2015-64436-P Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-264
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Publicat a:	Chemical science, Vol. 9 (March 2018) , p. 3932-3940, ISSN 2041-6539

DOI: 10.1039/c7sc04899h
PMID: 29780525

9 p, 1.4 MB

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