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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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The transport number is the fraction of the total current carried by an ion in an electrolyte solution. It is defined as the ratio of the current carried by a specific ion to the total current flowing through the solution. The transport number, t, is central to understanding ionic mobility, which describes how fast an ion moves under the influence of an electric field. This link connects the physical behavior of ions in solution to the chemical processes that occur during electrochemical...
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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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Using a Cyclic Ion Mobility Spectrometer for Tandem Ion Mobility Experiments
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Conformational Dynamics in Ion Mobility Data.

Salomé Poyer1, Clothilde Comby-Zerbino2, Chang Min Choi2

  • 1LAMBE, Université Evry Val d'Essonne, CEA, CNRS, Université Paris-Saclay , F-91025, Evry, France.

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Summary
This summary is machine-generated.

A new analytical model simulates spectral features in ion mobility spectrometry (IMS) arrival time distributions (ATDs) from interconverting isomers. This model aids in interpreting experimental data and extracting kinetic and thermodynamic information.

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Area of Science:

  • Analytical chemistry
  • Physical chemistry
  • Spectrometry

Background:

  • Spectral features in arrival time distributions (ATDs) from ion mobility spectrometry (IMS) often indicate coexisting isomeric species.
  • Interconversion between isomers influences ATD shape, but a quantitative model is lacking.

Purpose of the Study:

  • To develop an analytical model for simulating ATDs from interconverting species.
  • To validate the model with experimental data and explain instrument discrepancies.
  • To demonstrate the model's utility in extracting kinetic and thermodynamic data.

Main Methods:

  • Development of a novel analytical model for simulating ATDs.
  • Application of the model to experimental data from a bistable system.
  • Analysis of discrepancies in measurements across different IMS instruments.

Main Results:

  • The model successfully reproduces experimental ATD data for interconverting species.
  • The model explains variations in ATD shapes observed across different instruments.
  • The model provides a framework for quantitative analysis of isomer dynamics.

Conclusions:

  • The developed analytical model provides a quantitative description of interconverting species in IMS.
  • The model enhances the interpretation of ATDs and resolves instrument-specific measurement differences.
  • This approach enables the extraction of valuable kinetic and thermodynamic data from tandem-IMS experiments.