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Related Concept Videos

Proton (¹H) NMR: Chemical Shift01:07

Proton (¹H) NMR: Chemical Shift

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Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal.
Absorption signals of all the protium nuclei...
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NMR Spectroscopy: Chemical Shift Overview01:15

NMR Spectroscopy: Chemical Shift Overview

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The position of the absorption signal of a sample is reported relative to the position of the signal of tetramethylsilane (TMS), which is added as an internal reference while recording spectra. The difference between the absorption frequencies of the sample and TMS (in Hz) is divided by the spectrometer operating frequency (in MHz) to obtain a dimensionless quantity called the chemical shift. It is reported on the δ (delta) scale and expressed in parts per million.
For instance, the proton...
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¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons01:03

¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons

4.2K
Protons in identical electronic environments within a molecule are chemically equivalent and have the same chemical shift. The replacement test is a useful tool to identify chemical equivalence and predict NMR spectra. A substituent replaces each of the protons being examined and the resulting molecules are compared. If the same molecule is obtained, the protons are equivalent or homotopic. Replacement of any hydrogens in ethane by chlorine yields chloroethane because all six protons are...
4.2K
¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons00:58

¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons

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Replacing each alpha-hydrogen in chloroethane by bromine (or a different functional group) yields a pair of enantiomers. Such protons are called prochiral or enantiotopic and are related by a mirror plane. Enantiotopic protons are chemically equivalent in an achiral environment. Because most proton NMR spectra are recorded using achiral solvents, enantiotopic hydrogens yield a single signal.
In chiral compounds such as 2-butanol, replacing the methylene hydrogens at C3 produces a pair of...
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¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.9K
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...
1.9K
Behavior of Concrete Under Compressive Load01:23

Behavior of Concrete Under Compressive Load

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Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
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Application and Methodology of the Non-destructive 19F Time-domain NMR Technique to Measure the Content in Fluorine-containing Drug Products
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Compressed NMR: Combining compressive sampling and pure shift NMR techniques.

Juan A Aguilar1, Alan M Kenwright1

  • 1Chemistry Department, Durham University, Durham, UK.

Magnetic Resonance in Chemistry : MRC
|December 27, 2017
PubMed
Summary

Compressed sensing and pure shift techniques enhance multidimensional nuclear magnetic resonance (NMR) resolution. This combination overcomes limitations of slow sampling and signal multiplets, improving spectral quality.

Keywords:
NUScompressed sensingcompressive samplingnon-uniform samplingpure shiftresolution

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Physical Chemistry

Background:

  • Multidimensional nuclear magnetic resonance (NMR) spectroscopy resolution is significantly limited compared to spectrometer capabilities.
  • Key limitations include slow Nyquist sampling rates and signal multiplets instead of singlets.

Purpose of the Study:

  • To explore the potential and challenges of combining compressive sensing (CS) with pure shift techniques in NMR.
  • To demonstrate the application of compressed NMR in spectral analysis.

Main Methods:

  • Utilizing compressive sensing (CS) for sub-Nyquist sampling to accelerate data acquisition.
  • Employing pure shift techniques to convert signal multiplets into singlets, simplifying spectra.
  • Combining CS with appropriate pure shift experiments for enhanced NMR data.

Main Results:

  • Compressed NMR enables sampling at sub-Nyquist rates by exploiting spectral compressibility.
  • Pure shift techniques effectively resolve multiplets, improving spectral resolution.
  • Demonstrated examples of compressed NMR spectra and their integration with covariance methods.

Conclusions:

  • The combination of compressive sensing and pure shift techniques offers a powerful approach to overcome traditional resolution limitations in multidimensional NMR.
  • Compressed NMR significantly enhances spectral quality and analytical capabilities.