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

TitleA solid-state NMR investigation of the structure of mesoporous silica nanoparticle supported rhodium catalysts
Publication TypeJournal Article
Year of Publication2009
AuthorsRapp JL, Huang YL, Natella M, Cai Y, Lin VSY, Pruski M
Journal TitleSolid State Nuclear Magnetic Resonance
Volume35
Pages82-86
Date Published04
ISBN Number0926-2040
Accession NumberISI:000265325200005
Keywordsangle-spinning techniques, cross-polarization, indirectly detected hetcor, mesoporous silica nanoparticles, nuclear-magnetic-resonance, organic functionalization, oxidation, phosphine ligands, si-29 nmr, solid-state nmr, surfac, transition-metal-complexes
Abstract

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 Si-29 NMR experiments. The structural assignments of the rhodium-phosphinosilyl complex were unambiguously determined by employing the novel, indirectly detected heteronuclear correlation (C-13-H-1 and P-31-H-1 idHETCOR) techniques, which indicated that oxidation of the attached phosphinosilyl groups and detachment of Rh was enhanced upon syngas conversion. (C) 2008 Elsevier Inc. All rights reserved.

URL<Go to ISI>://000265325200005
DOI10.1016/J.Ssnmr.2008.12.004