TY - JOUR
T1 - Suppressing exchange effects in diffusion-ordered NMR spectroscopy
AU - Aguilar, Juan A.
AU - Adams, Ralph W.
AU - Nilsson, Lars Mathias
AU - Morris, Gareth A.
PY - 2014
Y1 - 2014
N2 - 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.
AB - 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.
U2 - 10.1016/j.jmr.2013.10.018
DO - 10.1016/j.jmr.2013.10.018
M3 - Journal article
C2 - 24263085
SN - 1090-7807
VL - 238
SP - 16
EP - 19
JO - Journal of Magnetic Resonance
JF - Journal of Magnetic Resonance
ER -