A solid-state NMR investigation of the structure of mesoporous silica nanoparticle supported rhodium catalysts

• Published in: Solid state nuclear magnetic resonance Vol. 35; no. 2; pp. 82 - 86
• Main Authors: Rapp, Jennifer L., Huang, Yulin, Natella, Michael, Cai, Yang, Lin, Victor S.-Y., Pruski, Marek
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier Inc 01.04.2009
• Subjects: Catalysis; Computer Simulation; Indirectly detected HETCOR; Magnetic Resonance Spectroscopy - methods; Mesoporous silica nanoparticles; Models, Chemical; Models, Molecular; Molecular Conformation; Nanoparticles - chemistry; Nanoparticles - ultrastructure; Oxidation; Phosphine ligands; Rhodium - chemistry; Silicon Dioxide - chemistry; Solid-state NMR; Phosphine ligands; Mesoporous silica nanoparticles; Solid-state NMR; Oxidation; Indirectly detected HETCOR
• ISSN: 0926-2040; 1527-3326
• DOI: 10.1016/j.ssnmr.2008.12.004

A detailed study of the chemical structure of mesoporous silica catalysts containing rhodium ligands and nanoparticles (RhP-MSN) was carried out by multi-dimensional solid-state NMR techniques. The degree of functionalization of the rhodium–phosphinosilyl complex to the surface of the RhP-MSN channels was determined by 29Si NMR experiments. The structural assignments of the rhodium–phosphinosilyl complex were unambiguously determined by employing the novel, indirectly detected heteronuclear correlation ( 13C– 1H and 31P– 1H idHETCOR) techniques, which indicated that oxidation of the attached phosphinosilyl groups and detachment of Rh was enhanced upon syngas conversion.