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Wang, Huan
첨단연성물질 연구단
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Using NMR to Test Molecular Mobility during a Chemical Reaction

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Title
Using NMR to Test Molecular Mobility during a Chemical Reaction
Author(s)
Huan Wang; Tian Huang; Steve Granick
Publication Date
2021-03
Journal
Journal of Physical Chemistry Letters, v.12, no.9, pp.2370 - 2375
Publisher
American Chemical Society
Abstract
We evaluate critically the use of pulsed gradient spin-echo nuclear magnetic resonance to measure molecular mobility during chemical reactions. With raw NMR spectra available in a public depository, we confirm the boosted mobility during the click chemical reaction (Wang et al. Science 2020 369, 537-541) regardless of the order of magnetic field gradient (linearly increasing, linearly decreasing, random sequence). We also confirm boosted mobility for the Diels-Alder chemical reaction. The conceptual advantage of the former chemical system is that a constant reaction rate implies a constant catalyst concentration, whereas that of the latter is the absence of a paramagnetic catalyst, precluding paramagnetism as an objection to the measurements. The data and discussion in this paper show the reliability of experiments when one avoids convection, allows decay of nuclear spin magnetization between successive pulses and recovery of its intensity between gradients, and satisfies quasi-steady state during the time window to acquire each datum. Especially important is to make comparisons on the time scale of the actual chemical reaction kinetics. We discuss possible sources of mistaken conclusions that are desirable to avoid.
URI
https://pr.ibs.re.kr/handle/8788114/9932
DOI
10.1021/acs.jpclett.1c00066
ISSN
1948-7185
Appears in Collections:
Center for Soft and Living Matter(첨단연성물질 연구단) > 1. Journal Papers (저널논문)
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