Journal
SOLID STATE NUCLEAR MAGNETIC RESONANCE
Volume 35, Issue 2, Pages 82-86Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ssnmr.2008.12.004
Keywords
Solid-state NMR; Indirectly detected HETCOR; Mesoporous silica nanoparticles; Phosphine ligands; Oxidation
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Funding
- US Department of Energy, Office of Basic Energy Sciences [DE-AC02-07CH11358]
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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.
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