Details

Autor(en) / Beteiligte

• Romanenko, Iuliia
• Gajan, David
• Sayah, Reine
• Crozet, Delphine
• Jeanneau, Erwan
• Lucas, Christine
• Leroux, Lénaic
• Veyre, Laurent
• Lesage, Anne
• Emsley, Lyndon
• Lacôte, Emmanuel
• Thieuleux, Chloé

Titel

Iridium(I)/N-Heterocyclic Carbene Hybrid Materials: Surface Stabilization of Low-Valent Iridium Species for High Catalytic Hydrogenation Performance

Ist Teil von

• Angewandte Chemie (International ed.), 2015-10, Vol.54 (44), p.12937-12941

Auflage

International ed. in English

Ort / Verlag

Weinheim: WILEY-VCH Verlag

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• An IrI(NHC)‐based hybrid material was prepared using a methodology which allowed the precise positioning and isolation of the Ir centers along the pore channels of a silica framework. The full characterization of the material by solid‐state NMR spectroscopy showed that the supported Ir sites were stabilized by the silica surface, as low‐coordinated single‐site complexes. The material is extremely efficient for the hydrogenation of functional alkenes. The catalytic performance (TOF and TON) is one to two orders of magnitude higher than those of their molecular Ir analogues, and could be related to the prevention of the bimolecular deactivation of Ir complexes observed under homogeneous conditions. Lending support: Homogeneous positioning of IrI complexes within the pore‐channels of a silica framework stabilizes a low‐valent IrI species and leads to drastically improved catalyst efficiency. Catalyst decomposition by formation of iridium‐hydride clusters is prevented by the attachment to the support. Mes=2,4,6‐trimethylphenyl.