Suppressing exchange effects in diffusion-ordered NMR spectroscopy

Aguilar, Juan A.; Adams, Ralph W.; Nilsson, Mathias; Morris, Gareth A.

Abstract

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.

Citation

Aguilar, J. A., Adams, R. W., Nilsson, M., & Morris, G. A. (2014). Suppressing exchange effects in diffusion-ordered NMR spectroscopy. Journal of Magnetic Resonance, 238, 16-19. https://doi.org/10.1016/j.jmr.2013.10.018

• Journal Article Type: Article
• Online Publication Date: Nov 1, 2013
• Publication Date: Jan 1, 2014
• Deposit Date: Oct 15, 2015
• Publicly Available Date: Feb 13, 2018
• Journal: Journal of Magnetic Resonance
• Print ISSN: 1090-7807
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 238
• Pages: 16-19
• DOI: https://doi.org/10.1016/j.jmr.2013.10.018
• Public URL: https://durham-repository.worktribe.com/output/1397776