Title

Double-Resonance and Two-Dimensional Silicon-29 NMR Spectroscopy of Minerals

Document Type

Article

Publication Date

3-1999

Abstract

Results of novel double-resonance and two-dimensional 29Si NMR measurements, including 27Al-to-29Si and 23Na-to-29Si cross-polarization, 29Si isotropic/anisotropic correlation, and 1H/29Si heteronuclear correlation experiments are reported. 27Al-to-29Si and 23Na-to-29Si cross-polarization were used to improve sensitivity, making two-dimensional 29Si NMR techniques more feasible. 29Si two-dimensional isotropic/anisotropic correlation spectra of the minerals albite, sepiolite, and gyrolite were measured and the principal components of the chemical-shift tensor for each site determined. A modified version of the TOSS-reTOSS pulse sequence was used and is shown to yield pure-phase isotropic/anisotropic correlation spectra. 1H/29Si heteronuclear correlation spectra of gyrolite and sepiolite were measured and used to assign 29Si resonances to distinct crystallographic sites, to determine the proximity between silicon and hydrogen atoms, and to study 1H-to-29Si cross-polarization dynamics.

Publication Title

Solid-State NMR Spectroscopy of Inorganic Materials

Volume

717

First Page

305

Last Page

325

DOI of Published Version

10.1021/bk-1999-0717.ch011

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