Determination of nitrogen chemical shift anisotropy from the second-order cross-term in 14N MAS NMR spectroscopy
✍ Scribed by Tania Giavani; Henrik Bildsøe; Jørgen Skibsted; Hans J. Jakobsen
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 532 KB
- Volume
- 377
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
A new method for determination of nitrogen chemical shift anisotropies (CSAs) employing 14 N MAS NMR spectroscopy is presented. The method utilizes the effect of the second-order cross-term between the quadrupolar coupling and chemical shift interaction in the average Hamiltonian on the lineshape for the individual resonances within the manifold of 14 N spinning sidebands, as illustrated by determination of the 14 N CSA for Pb(NO 3 ) 2 . The second-order functionality for this cross-term ensures that the CSA cannot be averaged by MAS. This is illustrated by determination of the 14 N CSA for Pb(NO 3 ) 2 spinning (12 kHz) at twice the magnitude of the 14 N CSA.