Cross-polarization/magic-angle-spinning silicon-29 nuclear magnetic resonance study of silica gel using trimethylsilane bonding as a probe of surface geometry and reactivity

Journal Article · Wed Dec 22 23:00:00 EST 1982 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100223a029· OSTI ID:5684385

Sindorf, D W; Maciel, G E

/sup 29/Si NMR experiments, using cross polarization (CP) and magic-angle spinning (MAS), were carried out on a variety of silica gels and the products of their trimethylsilylation reactions with the silylating agent, hexamethyldisilazane (HMDS). A methodology has been developed to provide quantitative relationships on structure and reactivity from the /sup 29/Si CP/MAS spectra. Geminal-hydroxyl silanol sites were found to be more reactive to HMDS than lone-hydroxyl silanol sites. Measured surface hydroxyl densities and trimethylsilane coverages are discussed in terms of structural models.

• Research Organization: Colorado State Univ., Fort Collins
• OSTI ID: 5684385
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 86:26; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORBENTS
CHEMICAL BONDS
EVEN-ODD NUCLEI
HYDRIDES
HYDROGEN COMPOUNDS
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ORIENTATION
POLARIZATION
RESONANCE
SILANES
SILICA GEL
SILICON 29
SILICON COMPOUNDS
SILICON ISOTOPES
SPIN ORIENTATION
STABLE ISOTOPES
STRUCTURAL CHEMICAL ANALYSIS
SURFACE PROPERTIES