期刊
MAGNETIC RESONANCE IN CHEMISTRY
卷 39, 期 -, 页码 S142-S148出版社
JOHN WILEY & SONS LTD
DOI: 10.1002/mrc.917
关键词
NMR; H-1 NMR; DOSY; BPPLED; diffusion; hydrogen bonding; tetramethylsilane; alcohols; viscosity; reference
The use of tetramethylsilane (TMS) as an internal diffusion reference for DOSY measurements related to molecular association forced by H-bond in solution is proposed. By using such a reference, it is possible to determine the extent to which the diffusion of the solutes is affected by changes in viscosity or H-bonding, after modifications in the composition of the solution under study. Therefore, changes in hydrodynamic radii due to H-bonding can be calculated. Three examples of the use of this reference in diffusion studies related to H-bonding are presented: the addition of an H-bond acceptor to a mixture of two compounds with very similar hydrodynamic radii and molecular weights, but where only one can be involved in H-bonding, the addition of an H-bond acceptor to a mixture of alcohols with different H-bond acidities and the addition of an H-bond acceptor to a mixture of two isomeric alcohols with different steric hindrances. Copyright (C) 2001 John Wiley & Sons, Ltd.
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