Strong spin-spin coupling effects arising from fast exchange between weakly coupled spin systems

It is demonstrated that the criterion for the determination of whether a spin-spin interaction ( J ij ) is “strong” or “weak” by comparing J ij with the corresponding chemical shift difference | ω i − ω j | needs modification in the presence of exchange, especially if rapid exchange conditions preva...

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Bibliographic Details
Published in:Journal of magnetic resonance (1969) 1981-01, Vol.44 (2), p.270-276
Main Authors: Vasavada, K.V, Kaplan, J.I, Nageswara Rao, B.D
Format: Article
Language:English
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Summary:It is demonstrated that the criterion for the determination of whether a spin-spin interaction ( J ij ) is “strong” or “weak” by comparing J ij with the corresponding chemical shift difference | ω i − ω j | needs modification in the presence of exchange, especially if rapid exchange conditions prevail. In particular, it is shown using computer-generated spectra for ABC ⇄ A′B′ + C′ exchange that two weakly coupled spin systems in fast exchange can yield a spectrum with strong coupling features.
ISSN:0022-2364
1557-8968
DOI:10.1016/0022-2364(81)90169-4