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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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 slanted or...
Atomic Nuclei: Magnetic Resonance01:05

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
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NMR Spectroscopy: Spin–Spin Coupling01:08

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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved in...
Applications Of NMR In Biology01:25

Applications Of NMR In Biology

Nuclear magnetic resonance (NMR) spectroscopy is a very valuable analytical technique for researchers. It has been used for more than 50 years as an analytical tool. F. Bloch and E. Purcell formulated NMR in 1946 and won the 1952 Nobel Prize in Physics  for their work. Biological macromolecules such as proteins, nucleic acids, lipids, and organic molecules including pharmaceutical compounds, can be studied using this versatile tool that exploits the magnetic properties of certain nuclei.
The...
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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.
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Updated: Jun 5, 2026

High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy
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High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy

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Diffusion exchange NMR spectroscopy in inhomogeneous magnetic fields.

Oliver Neudert1, Siegfried Stapf, Carlos Mattea

  • 1Fachgebiet Technische Physik II/Polymerphysik, Institute of Physics, Technische Universität Ilmenau, PO Box 100 565, 98684 Ilmenau, Germany.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|December 28, 2010
PubMed
Summary

This study introduces a new method for studying molecular diffusion and exchange in porous materials using low-field Nuclear Magnetic Resonance (NMR). The technique enhances measurements in zeolites, offering valuable insights into transport properties.

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Area of Science:

  • Magnetic Resonance Imaging
  • Materials Science
  • Physical Chemistry

Background:

  • Studying molecular transport in porous materials is crucial for understanding various chemical and physical processes.
  • Traditional Nuclear Magnetic Resonance (NMR) methods can be limited in low-field environments, especially for complex systems like zeolites.
  • The stray field of single-sided NMR sensors offers a unique platform for specialized NMR experiments.

Purpose of the Study:

  • To develop and present a two-dimensional diffusion exchange pulse sequence for low-field NMR.
  • To investigate the diffusion and molecular exchange properties of organic solvents within a mesoporous zeolite matrix.
  • To demonstrate the applicability of this technique in inexpensive, mobile NMR devices.

Main Methods:

  • Implementation of two-dimensional diffusion exchange experiments using a strong, static magnetic field gradient.
  • Utilizing a single-sided NMR sensor with a proton Larmor frequency of 11.7 MHz.
  • Employing a phase cycling scheme to select specific coherence pathways for accurate measurements.
  • Application of the pulse sequence to organic solvents within 0.8 nm zeolite pores.

Main Results:

  • Successful application of the developed pulse sequence to study diffusion and molecular exchange in zeolites.
  • Demonstration of the technique's ability to probe transport properties in mesoporous media.
  • Achieved satisfying sensitivity within measurement times of a few hours.

Conclusions:

  • The presented pulse sequence extends the capabilities of low-field NMR for studying transport phenomena in porous materials.
  • This method provides a sensitive and time-efficient approach for analyzing molecular dynamics in complex matrices.
  • The findings pave the way for utilizing affordable, mobile NMR devices in materials science research.