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Related Concept Videos

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

Two-Dimensional (2D) NMR: Overview

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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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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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2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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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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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

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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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¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

2.2K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.9K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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In Situ Monitoring of Diffusion of Guest Molecules in Porous Media Using Electron Paramagnetic Resonance Imaging
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Experimental identification of diffusive coupling using 2D NMR.

Y-Q Song1, G Carneiro2, L M Schwartz1

  • 1Schlumberger-Doll Research, One Hampshire Street, Cambridge, Massachusetts 02139, USA.

Physical Review Letters
|December 20, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces a novel 2D Nuclear Magnetic Resonance (NMR) technique to analyze pore size distributions in complex materials. It overcomes limitations of traditional methods by directly analyzing time-dependent data, revealing diffusive coupling between pores.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Analytical Chemistry

Background:

  • Nuclear Magnetic Resonance (NMR) is widely used for pore size distribution analysis.
  • Traditional NMR methods assume fast diffusion within pores and neglect inter-pore diffusion.
  • These assumptions are often violated in complex materials, complicating relaxation time analysis.

Purpose of the Study:

  • To develop a new 2D NMR technique to overcome limitations of existing methods.
  • To identify and analyze diffusive coupling between pores in complex materials.
  • To provide a more accurate interpretation of pore structure.

Main Methods:

  • A novel 2D NMR technique was developed.
  • Associated data analysis was created to work directly with time-dependent experimental data.
  • Laplace inversion was avoided to directly identify diffusive coupling signatures.

Main Results:

  • The new technique successfully identified the signature of diffusive coupling between pores.
  • Measurements on microporous glass beads demonstrated the technique's efficacy.
  • Numerical simulations corroborated the experimental findings.

Conclusions:

  • The presented 2D NMR method offers a more robust approach to pore size distribution analysis in complex materials.
  • It allows for the direct observation of diffusive coupling, improving interpretation accuracy.
  • This technique enhances the understanding of pore network dynamics.