期刊
ORGANOMETALLICS
卷 40, 期 11, 页码 1571-1576出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.organomet.1c00258
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资金
- Centre National de la Recherche Scientifique
- Universite de Toulouse
- Agence Nationale de la Recherche [ANR-19-CE07-0037]
- Fonds National Suisse de la Recherche Scientifique
The oxidation of Au(I) complexes with two hemilabile ligands resulted in the stabilization of Au(III) complexes through chelation by phosphine-amine (P^N) and mesoionic N-heterocyclic carbene-pyridine (C^N) ligands. The structures of all complexes were confirmed by NMR spectroscopy and X-ray diffraction analyses.
The oxidation of Au(I) complexes featuring two hemilabile ligands was investigated. The phosphine-amine (P<^>N) and mesoionic N-heterocyclic carbene-pyridine (C<^>N) ligands were shown to stabilize the ensuing Au(III) complexes by chelation. Oxidation of (MeDalphos)AuCl with PhICl2 directly affords the corresponding P<^>N-chelated cationic Au(III) complex without requiring a chloride abstractor. The C<^>N hemilabile ligand is shown to efficiently chelate Au(III), but not Au(I). Cationization of the (C<^>N)AuCl complex 3 affords the dinuclear complex 4 with the C<^>N ligand bridging two Au centers. Oxidation of 3 with PhICl2 does not spontaneously enforce coordination of the pyridine side arm, as with the P<^>N ligand. However, cationization of the resulting AuCl3 complex 5 with a chloride abstractor successfully promoted pyridine chelation. The structures of all complexes have been ascertained by NMR spectroscopy and X-ray diffraction analyses.
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