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NMR Spectrometers: Resolution and Error Correction01:14

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
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Updated: Sep 5, 2025

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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High resolution solid state NMR in paramagnetic metal-organic frameworks.

C A Klug1, M W Swift2, J B Miller1

  • 1Chemistry Division, U.S. Naval Research Laboratory, Washington, DC, USA.

Solid State Nuclear Magnetic Resonance
|July 6, 2022
PubMed
Summary
This summary is machine-generated.

Nuclear magnetic resonance (NMR) spectroscopy reveals detailed insights into the metal-organic framework ZIF-67. This study demonstrates NMR

Keywords:
Contact shiftDipole-dipole shiftMOFNMRParamagneticZIF-67

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Spectroscopy

Background:

  • Metal-organic frameworks (MOFs) like ZIF-67 are porous materials with diverse applications.
  • Understanding guest molecule interactions within MOFs is crucial for optimizing their performance.

Purpose of the Study:

  • To investigate the utility of nuclear magnetic resonance (NMR) spectroscopy for characterizing ZIF-67 and guest molecules.
  • To assign NMR signals to specific sites within the ZIF-67 structure.

Main Methods:

  • Utilized 1H and 13C nuclear magnetic resonance (NMR) spectroscopy.
  • Analyzed orbital chemical shifts and paramagnetic effects from cobalt ions.
  • Performed first-principles calculations for comparison with experimental data.

Main Results:

  • Observed spinning sideband manifolds due to hyperfine interactions between paramagnetic cobalt and NMR-active nuclei.
  • Achieved good agreement between experimental and calculated chemical shifts and relaxation rates.
  • Demonstrated high-resolution NMR spectra for molecules within the MOF pores.

Conclusions:

  • NMR spectroscopy is a powerful tool for the high-confidence assignment of peaks in ZIF-67.
  • Fast spin-lattice relaxation rates were observed for guest molecules due to couplings with Co2+ nodes.
  • NMR can effectively identify and characterize guest species in MOFs for various applications.