29Si NMR in solid state with CPMG acquisition under MAS
A remarkable enhancement of sensitivity can be often achieved in {sup 29}Si solid-state NMR by applying the well-known Carr-Purcell-Meiboom-Gill (CPMG) train of rotor-synchronized {pi} pulses during the detection of silicon magnetization. Here, several one- and two-dimensional (1D and 2D) techniques are used to demonstrate the capabilities of this approach. Examples include 1D {sup 29}Si{l_brace}X{r_brace} CPMAS spectra and 2D {sup 29}Si{l_brace}X{r_brace} HETCOR spectra of mesoporous silicas, zeolites and minerals, where X = {sup 1}H or {sup 27}Al. Data processing methods, experimental strategies and sensitivity limits are discussed and illustrated by experiments. The mechanisms of transverse dephasing of {sup 29}Si nuclei in solids are analyzed. Fast magic angle spinning, at rates between 25 and 40 kHz, is instrumental in achieving the highest sensitivity gain in some of these experiments. In the case of {sup 29}Si-{sup 29}Si double-quantum techniques, CPMG detection can be exploited to measure homonuclear J-couplings.
- Research Organization:
- Ames Lab., Ames, IA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-07CH11358
- OSTI ID:
- 963096
- Report Number(s):
- IS-J 7311; TRN: US200917%%167
- Journal Information:
- Journal of magnetic Resonance, Vol. 193, Issue 2
- Country of Publication:
- United States
- Language:
- English
Similar Records
Characterization of nanostructured organic-inorganic hybrid materials using advanced solid-state NMR spectroscopy
Determination of Al-Si connectivities in zeolites with 2D Al-Si RAPT-CPMG-HETCOR NMR