Leroy R, Pedinielli F, Bourbon G, Nuzillard JM, Lameiras P. Use of Diethanolamine as a Viscous Solvent for Mixture Analysis by Multidimensional Heteronuclear
ViscY NMR Experiments.
Anal Chem 2022;
94:9278-9286. [PMID:
35737881 DOI:
10.1021/acs.analchem.2c00536]
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Abstract
Diethanolamine/DMSO-d6 as a viscous binary solvent is first reported for the individualization of low-polarity mixture components by multidimensional heteronuclear ViscY NMR experiments under spin diffusion conditions. Solvent viscosity induces the slowing down of molecular tumbling, hence promoting magnetization transfer by dipolar longitudinal cross-relaxation. As a result, all 1H nuclei resonances within the same molecule may correlate in a 2D nuclear Overhauser effect spectroscopy (NOESY) spectrum, giving access to mixture analysis. We offer a new way to analyze mixtures by considering 3D heteronuclear heteronuclear single-quantum coherence-NOESY (HSQC-NOESY) experiments under viscous conditions. We state the individualization of four low-polarity chemical compounds dissolved in the diethanolamine/DMSO-d6 solvent blend using homonuclear selective 1D, 2D 1H-1H NOESY experiments and heteronuclear 1D, 2D 1H-19F heteronuclear Overhauser effect spectroscopy, 2D 1H-19F, 1H-31P HSQC-NOESY, and 3D 1H-19F-1H, 1H-31P-1H HSQC-NOESY experiments by taking profit from spin diffusion.
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