Two-dimensional exchange spectroscopy revisited: Accounting for the number of participating spins

Two-dimensional exchange spectroscopy revisited: Accounting for the number of participating spins

The magnetization exchange between two groups of equivalent spins each having different populations and overall relaxation rates has been analyzed. The results suggest that either the spin population difference or the overall relaxation rate difference in an exchange spectrum can produce cross-peaks...

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Bibliographic Details
Published in:Journal of the Serbian Chemical Society Vol. 65; no. 5-6; pp. 285 - 301
Main Authors: Juranić Nenad, Zolnai Zsolt, Macura Slobodan
Format: Journal Article
Language:English
Published: Serbian Chemical Society 01-01-2000
Subjects:
chemical exchange
exchange spetroscopy
hydrogen exchange
nmr
Online Access:Get full text
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Summary:The magnetization exchange between two groups of equivalent spins each having different populations and overall relaxation rates has been analyzed. The results suggest that either the spin population difference or the overall relaxation rate difference in an exchange spectrum can produce cross-peaks with volumes larger than that of the corresponding diagonal line. This is important for interpretation of the magnetization exchange between water and macromolecular protons where both the population differences and auto-relaxation rate differences can be very large. Theoretical predictions of peak volume evolution were experimentally verified in the intermolecular magnetization exchange between the water and labile amide proton in a model system N-acetylglycine/water.
ISSN:0352-5139
1820-7421
DOI:10.2298/JSC0006285J