Resolving two inequivalent sites with deuterium MAS NMR
✍ Scribed by Ae Ja Kim; Leslie G. Butler
- Publisher
- Elsevier Science
- Year
- 1992
- Weight
- 548 KB
- Volume
- 99
- Category
- Article
- ISSN
- 0022-2364
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Solid-state deuterium NMR has been used to detect Bronsted acid sites and non-acidic silanols in D-exchanged zeohtes. The quadrupolar coupling constant for Bronsted sites in D-Y zeolite is 234 + 2 kHz, and the sites are axially symmetric. This reduction by t from the water O-D coupling constant is i
## Abstract The two‐dimensional QUADSHIFT experiment is introduced, which permits the separation of chemical shifts and quadrupolar couplings in solid‐state magic angle spinning NMR spectra of powder samples. The technique was applied to partially deuteriated norcamphor and camphor under slow magic
Al MAS NMR spectra from two poiymorphs of AlaSi05, kyanite and andalusite, are presented. Unambiguous extraction of quadrupole interactions of up to 15.5 MHz (= C,=e2gQ/h) are possible from fast MAS( > 18 kHz) NMR spectra obtained at an applied magnetic field of 11.7 T. It is shown from a knowledge