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Fast reactions occurring in times shorter than the time needed to mix reactants pose a unique challenge for investigation. In a liquid-phase continuous-flow system, reactants A and B are swiftly pushed into the mixing chamber, where mixing occurs within 1 ms. The reaction mixture then flows through an observation tube, and one measures light absorption to determine species concentrations at various points of the tube. This method is most appropriate when relatively large volumes of reactants...
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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Updated: May 6, 2026

Measuring the Time-Evolution of Nanoscale Materials with Stopped-Flow and Small-Angle Neutron Scattering
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A Stopped-Flow Instrument for Millisecond Timescale Reaction Monitoring on a Standard NMR Spectrometer.

Andrew M R Hall1, Edward J King2, Lloyd A L Mitchell1

  • 1School of Chemistry, the University of Edinburgh, Edinburgh, UK.

Magnetic Resonance in Chemistry : MRC
|May 5, 2026
PubMed
Summary
This summary is machine-generated.

A new stopped-flow instrument enables rapid kinetic measurements using standard NMR spectrometers, analyzing reactions with millisecond half-lives. This innovation allows for precise, reproducible NMR data collection from fast chemical processes.

Keywords:
19F1HNMRhardwareinstrumentationkineticsline‐shapemixingstopped‐flow

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Area of Science:

  • Analytical Chemistry
  • Physical Chemistry
  • Spectroscopy

Background:

  • Standard NMR spectrometers are limited in analyzing fast chemical reactions.
  • Rapid kinetic measurements are crucial for understanding reaction mechanisms.
  • Existing stopped-flow techniques may not be compatible with standard NMR setups.

Purpose of the Study:

  • To develop and characterize a novel stopped-flow instrument for rapid reaction initiation and analysis.
  • To enable kinetic measurements of reactions with millisecond half-lives using standard NMR spectrometers.
  • To provide a versatile tool for studying fast chemical kinetics without spectrometer modification.

Main Methods:

  • Design and construction of a new stopped-flow instrument integrated with standard NMR spectrometers.
  • Utilizing high-speed video, pressure, and NMR line-shape data for instrument characterization.
  • Employing simulations to address dead time effects on observed rate constants.
  • Demonstrating capabilities with base-mediated hydrolysis of methyl formate (¹H) and pentafluorophenyl boronic acid (¹⁹F).

Main Results:

  • The instrument successfully performs kinetic measurements on reactions with half-lives as short as 5 milliseconds.
  • Reproducible NMR data from fast reactions were generated, validating the instrument's performance.
  • Reactant equilibration and efficient mixing ensure near-quantitative results.
  • The system requires no permanent modifications to existing NMR spectrometers.

Conclusions:

  • The developed stopped-flow instrument is effective for analyzing rapid reactions using standard NMR.
  • It offers a valuable method for obtaining kinetic data from fast chemical processes with high reproducibility.
  • The design facilitates integration with existing NMR setups, broadening accessibility for kinetic studies.