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Related Concept Videos

NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

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NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
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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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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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2D NMR: Overview of Homonuclear Correlation Techniques01:16

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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.
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Anisotropic NMR data acquisition with a prototype 400 MHz cryogen-free NMR spectrometer.

Maria Victoria Silva Elipe1, Ikenna Edward Ndukwe1, Armando Navarro-Vázquez2

  • 1Department of Attribute Sciences, Amgen Inc, Thousand Oaks, California, USA.

Magnetic Resonance in Chemistry : MRC
|August 2, 2023
PubMed
Summary

High-temperature superconducting (HTS) magnets offer cost-effective, cryogen-free nuclear magnetic resonance (NMR) spectroscopy. This study validates their performance for stereochemical analysis using anisotropic NMR data, demonstrating their utility in modern chemistry labs.

Keywords:
HSQCNMRanisotropic NMRartemetherartemisinindihydroartemisininepimeric mixturehigh-temperature superconducting (HTS) magnetpoly-HEMA gelresidual dipolar couplings

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Spectroscopy

Background:

  • High-temperature superconducting (HTS) materials enable cryogen-free magnets for nuclear magnetic resonance (NMR) spectroscopy.
  • These HTS NMR spectrometers reduce costs and simplify laboratory integration compared to traditional cryogen-based systems.
  • The performance and stability of HTS magnets in demanding applications like NMR in anisotropic media require thorough evaluation.

Purpose of the Study:

  • To evaluate the utility of a prototype 400 MHz cryogen-free HTS NMR spectrometer for stereochemical analysis.
  • To assess the accuracy of anisotropic NMR data, specifically residual dipolar couplings, measured using HTS magnets.
  • To investigate the performance of HTS magnets in complex pulse sequence experiments.

Main Methods:

  • Utilized a prototype 400 MHz cryogen-free, power-driven HTS NMR spectrometer installed in a chemistry laboratory fumehood.
  • Performed stereochemical analysis on three natural products: artemisinin, artemether, and dihydroartemisinin.
  • Measured anisotropic NMR data, focusing on residual dipolar couplings, and analyzed accuracy using the CASE-3D fitting protocol in Mestrenova-StereoFitter software.

Main Results:

  • The HTS NMR spectrometer successfully acquired anisotropic NMR data for stereochemical analysis of natural products.
  • The CASE-3D fitting protocol demonstrated the accuracy of residual dipolar coupling measurements obtained with the HTS magnet.
  • The study provides initial insights into the stability and performance of HTS magnets for advanced NMR applications.

Conclusions:

  • The cryogen-free HTS NMR spectrometer is a viable tool for stereochemical analysis, particularly for measurements requiring anisotropic NMR data.
  • HTS magnet technology shows promise for cost-effective and accessible NMR spectroscopy in diverse chemical research settings.
  • Further investigation into long-term stability and performance across a wider range of complex experiments is warranted.