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Dynamic NMR: A new intensity ratio for evaluation of lifetime in paripartite A ⇌ B systems
Author(s) -
Dimitrov Valentin S.
Publication year - 1976
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270080306
Subject(s) - coalescence (physics) , intensity (physics) , simple (philosophy) , mathematics , spectrum (functional analysis) , point (geometry) , statistical physics , physics , quantum mechanics , geometry , philosophy , epistemology , astrobiology
A simple formula for evaluation of rates of exchange in paripartite A ⇌ B systems is introduced. It is concerned only with the intensity ratio in a two‐site system in much the same way as that of Rogers and Woodbrey, but the new formula is also applicable above the coalescence point of the spectrum. The formula has been applied to the classical case of N , N ‐dimethyltrichloroacetamide. An error analysis demonstrates that the approximations inherent in the derivation of the new formula lead to smaller errors than do those of Rogers and Woodbrey.