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Related Concept Videos

NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

649
When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
649
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

989
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
989
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

1.0K
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.
1.0K
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

796
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...
796
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

1.2K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
1.2K
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

152
Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
152

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Updated: May 25, 2025

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Microstructural geometry revealed by NMR line shape analysis.

Mohamad Niknam1, Louis-S Bouchard1

  • 1Department of Chemistry and Biochemistry, University of California Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095-1059, USA and Center for Quantum Science and Engineering, UCLA, 475 Portola Plaza, Los Angeles, California 90095, USA.

The Journal of Chemical Physics
|February 27, 2025
PubMed
Summary
This summary is machine-generated.

We developed a new NMR technique to reveal angstrom-scale microstructural geometry in porous materials. This method uses weak magnetic fields to analyze NMR line shapes, offering high resolution for complex material structures.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Nanotechnology

Background:

  • Nuclear Magnetic Resonance (NMR) line shape analysis is crucial for understanding porous materials.
  • Traditional methods often require strong magnetic field gradients for high resolution.
  • Existing techniques may not fully capture complex microstructural geometries.

Purpose of the Study:

  • To introduce a novel NMR technique for angstrom-scale microstructural geometry extraction.
  • To demonstrate the capability of analyzing NMR line shapes with weak magnetic field gradients.
  • To investigate gas diffusion in confined systems like carbon nanotubes.

Main Methods:

  • Utilizing NMR line shape analysis with weak magnetic field gradients.
  • Employing molecular dynamics (MD) simulations coupled with the generalized Langevin equation.
  • Calculating transport properties using the Green-Kubo correlation function for time-dependent diffusion.

Main Results:

  • Achieved angstrom-scale resolution in microstructural geometry extraction.
  • Demonstrated that detailed line shape analysis reveals geometry at smaller scales than previously thought.
  • Successfully simulated and analyzed xenon diffusion in carbon nanotubes, showing confinement effects.

Conclusions:

  • NMR methodologies can be adapted for effective structural investigation of complex geometries at very small scales.
  • The developed technique offers high resolution with weaker magnetic fields compared to traditional PFG NMR.
  • Expected applications in materials science, catalysis, and biomedicine.