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Related Concept Videos

2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

795
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...
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Two-Dimensional (2D) NMR: Overview01:12

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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.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

892
Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

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Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
2.1K
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
1.6K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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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...
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Two-Dimensional Correlation of Isotropic and Directional Diffusion Using NMR.

João P de Almeida Martins1, Daniel Topgaard1

  • 1Division of Physical Chemistry, Department of Chemistry, Lund University, 221 00 Lund, Sweden.

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This study introduces a new diffusion nuclear magnetic resonance (NMR) method to accurately analyze complex porous materials. The technique resolves ambiguities arising from varied pore structures, improving material characterization.

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Area of Science:

  • Physics
  • Materials Science
  • Chemistry

Background:

  • Diffusion nuclear magnetic resonance (NMR) is crucial for characterizing porous media.
  • Ambiguities arise in NMR diffusion studies of samples with heterogeneous pore structures (varying size, shape, orientation).

Purpose of the Study:

  • To develop a novel diffusion NMR method to overcome limitations in analyzing complex porous media.
  • To resolve ambiguities caused by diverse pore characteristics.

Main Methods:

  • Inspired by solid-state NMR, a new diffusion NMR approach was developed.
  • Numerical data inversion utilized sparse representation in a basis of radial and axial diffusivities.
  • Experiments were conducted on a composite sample containing a cell suspension and a liquid crystal.

Main Results:

  • The proposed diffusion NMR method successfully resolved ambiguities in samples with complex pore structures.
  • Demonstrated capability to differentiate regions with varying pore characteristics.

Conclusions:

  • The novel diffusion NMR technique offers enhanced precision for studying heterogeneous porous materials.
  • This method provides a valuable tool for advanced material characterization and analysis.