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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...
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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.
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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.
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In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is...
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Aromatic compounds can be identified or analyzed using proton NMR and carbon‐13 NMR. Typically, aromatic hydrogens or hydrogens directly bonded to the aromatic rings are strongly deshielded by the aromatic ring current. Therefore, they absorb in the range of 6.5–8.0 ppm in proton NMR spectra. For instance, aromatic hydrogens directly bonded to the benzene ring absorb at 7.3 ppm. However, aromatic hydrogens of larger rings absorb farther upfield or downfield than the ideal range.
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Simple unsubstituted benzene has six aromatic protons, all chemically equivalent. Therefore, benzene exhibits only a singlet peak at δ 7.3 ppm in the 1H NMR spectrum. The observed shift is far downfield because the aromatic ring current strongly deshields the protons. Any substitution on the benzene ring makes the aromatic protons nonequivalent, and the protons split each other. The peak is, therefore, no longer a singlet and the splitting pattern and their associated coupling...
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A pure shift and spin echo based approach for high-resolution diffusion-ordered NMR spectroscopy.

Chen Li1, Haolin Zhan1, Jin Yan1

  • 1Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|July 17, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a novel Diffusion-Ordered NMR Spectroscopy (DOSY) method. It enhances spectral resolution and suppresses chemical exchange, improving the analysis of complex mixtures.

Keywords:
Chemical exchangeDiffusion ordered spectroscopyHigh-resolutionPure shift NMRSpectral congestion

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Nuclear Magnetic Resonance (NMR)

Background:

  • Diffusion-Ordered NMR Spectroscopy (DOSY) is valuable for analyzing compound mixtures based on diffusion.
  • Conventional DOSY suffers from limited spectral resolution, especially for complex mixtures with crowded resonances.
  • Chemical exchange effects in DOSY can lead to spurious signals, complicating data interpretation.

Purpose of the Study:

  • To develop a general DOSY method that overcomes the limitations of conventional techniques.
  • To achieve high-resolution 2D DOSY spectra for complex mixtures.
  • To suppress chemical exchange and J-coupling effects in DOSY measurements.

Main Methods:

  • A novel DOSY method is proposed utilizing pure shift extraction.
  • Spin echo evolution is incorporated to enhance spectral resolution and suppress artifacts.
  • The method is validated through theoretical analysis and experimental testing.

Main Results:

  • The proposed method yields high-resolution 2D DOSY spectra.
  • Effective suppression of chemical exchange and J-coupling effects was achieved.
  • The technique demonstrated utility in analyzing complex mixtures with crowded or overlapped resonances.

Conclusions:

  • The developed DOSY method provides superior resolution for analyzing complex mixtures.
  • It effectively mitigates challenges posed by crowded resonances and chemical exchange.
  • This advancement offers a powerful tool for detailed compound mixture analysis using NMR.