Evaluation of Spin Relaxation Induced by Chemical Shielding Anisotropy: A Comment on the Importance of the Antisymmetric Component
✍ Scribed by Jozef Kowalewski; Lawrence Werbelow
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 125 KB
- Volume
- 128
- Category
- Article
- ISSN
- 1090-7807
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✦ Synopsis
General comments related to the impact of the antisymmetric
Moreover, there is one additional subtle feature which is component of the electronic shielding tensor in context of nuclear generally ignored. For nuclei situated at sites with low local magnetic relaxation studies are given. It is argued that in most symmetry, the shielding tensor is characterized by an intrinconceivable applications of high field NMR, the effects associated sic antisymmetry (4, 5). Although only two experimentswith the antisymmetric component will be negligible. However, in one utilizing T 1 /T 2 ratios (6) and the other exploiting intercertain situations, this conventional wisdom may fail and, as an ference effects (7) -have detected this intriguing parameextreme example, it is demonstrated that for highly nonaxially ter, the fact that it has escaped experimental detection does symmetric shieldings, motional anisotropy may accentuate dranot imply, necessarily, that it is small. matically the relative importance of the antisymmetry. ᭧ 1997
Frequently, each relaxation mechanism has its own char-Academic Press acteristic signature which enables identification, isolation,