ArticleMagnetic resonance in chemistry : MRC2026
A Stopped-Flow Instrument for Millisecond Timescale Reaction Monitoring on a Standard NMR Spectrometer.
Article in Magnetic resonance in chemistry : MRC, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
We report a new stopped-flow instrument designed for initiation and analysis of rapid reactions using standard NMR spectrometers and probes. The instrument is capable of kinetic measurements on mixing-initiated reactions with half-lives as short as 5 milliseconds. Design features of the instrument are discussed, with high-speed video footage, pressure and NMR line-shape data used to characterise mixing and stopping of reagent flows. The reactants are thermally and magnetically equilibrated prior to initiation of mixing and transport of the nascent reaction to the active volume for application of the NMR pulse sequence, ensuring near-quantitative results. NMR data acquisition and processing require special considerations for fast reactions, and simulations were carried out to investigate the effect of composite instrument dead times on the observed rate constant. The kinetics of base-mediated hydrolysis of methyl formate (
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