Nuclear magnetic relaxation of spin- [formula omitted] nuclei involved in chemical exchange
The equations for the effect of chemical exchange on nuclear magnetic relaxation have been modified to take account of nonexponential relaxation “in the absence of exchange” at one or both of the sites involved in two-site exchange. The equations were then solved for the case of a spin- 3 2 quadrupo...
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| Published in | Journal of magnetic resonance (1969) Vol. 8; no. 4; pp. 344 - 353 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier Inc
01.12.1972
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| Online Access | Get full text |
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| Summary: | The equations for the effect of chemical exchange on nuclear magnetic relaxation have been modified to take account of nonexponential relaxation “in the absence of exchange” at one or both of the sites involved in two-site exchange. The equations were then solved for the case of a spin-
3
2
quadrupolar-relaxed nucleus by means of a simplifying procedure which, under certain circumstances, can be applied to other cases involving nonexponential relaxation “in the absence of exchange.”
In general, it was found that the relaxation of anexchanging, spin-
3
2
, quadrupolar-relaxed nucleus is the sum of four exponentials, if one or both of the sites is not under conditions of extreme narrowing (i.e., nonexponentially relaxed in the absence of exchange). However, in the limit where the relaxation times and exchange time at one site are much smaller than at the other site, the relaxation reduced to the sum of two exponentials. |
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| ISSN: | 0022-2364 1557-8968 |
| DOI: | 10.1016/0022-2364(72)90052-2 |