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Related Concept Videos

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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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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Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...
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Updated: Feb 6, 2026

Preparation of Fungal and Plant Materials for Structural Elucidation Using Dynamic Nuclear Polarization Solid-State NMR
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Materials Characterization by Dynamic Nuclear Polarization-Enhanced Solid-State NMR Spectroscopy.

Aaron J Rossini1,2

  • 1Department of Chemistry , Iowa State University , Ames , Iowa 50011 , United States.

The Journal of Physical Chemistry Letters
|August 15, 2018
PubMed
Summary
This summary is machine-generated.

High-field dynamic nuclear polarization (DNP) significantly boosts solid-state NMR sensitivity, enabling detailed analysis of organic and inorganic materials for improved design.

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Area of Science:

  • Materials Science
  • Spectroscopy
  • Physical Chemistry

Background:

  • Solid-state NMR spectroscopy offers high-resolution insights into material structure and bonding.
  • Limited sensitivity restricts the application of NMR to many solid materials.
  • Dynamic Nuclear Polarization (DNP) is a key technique for sensitivity enhancement.

Purpose of the Study:

  • To provide an overview of DNP-enhanced solid-state NMR spectroscopy.
  • To highlight its applications in studying organic and inorganic materials.
  • To demonstrate its utility in establishing structure-activity relationships for material design.

Main Methods:

  • Utilizing high-field dynamic nuclear polarization (DNP) to enhance NMR signal sensitivity.
  • Applying DNP-enhanced solid-state NMR spectroscopy to diverse organic and inorganic materials.
  • Correlating structural insights from NMR with material activity.

Main Results:

  • DNP enhances solid-state NMR sensitivity by 1-3 orders of magnitude.
  • DNP-NMR provides detailed molecular structure information.
  • Enables the formation of structure-activity relationships.

Conclusions:

  • DNP-enhanced solid-state NMR is a powerful, broadly applicable technique.
  • It overcomes sensitivity limitations of traditional NMR.
  • Facilitates rational design and improvement of materials through structure-activity insights.