期刊
JOURNAL OF MAGNETIC RESONANCE
卷 238, 期 -, 页码 16-19出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2013.10.018
关键词
DOSY; Diffusion; Chemical exchange; Spin echo
资金
- Engineering and Physical Sciences Research Council [EP/H024336/1, EP/1007989/1]
- EPSRC [EP/H024336/1, EP/I007989/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/I007989/1, EP/H024336/1] Funding Source: researchfish
In diffusion-ordered spectroscopy (DOSY) the aim is to separate signals from different molecular species according to their different diffusion coefficients. Each species has its individual diffusion coefficient (that may accidentally coincide with that of another species, e.g. if they are of very similar size). In exchanging systems, however, there is a serious complication in that the apparent diffusion coefficient of an exchanging signal will be a compromise that depends, among other factors, on the diffusion coefficients of the exchange partners and the rate of exchange between them. The DOSY spectrum will be much harder to interpret and can often give the appearance of extra (spurious) components in the mixture. Here a new and surprisingly simple experiment is described that suppresses the effects of exchange on apparent diffusion coefficients, restoring the simplicity of interpretation enjoyed by non-exchanging systems. (C) 2013 The Authors. Published by Elsevier Inc. All rights reserved.
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