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NMR Spectrometers: Overview01:20

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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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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
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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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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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Two-Dimensional (2D) NMR: Overview01:12

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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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A simple low-cost single-crystal NMR setup.

Mads S Vinding1, Tommy O Kessler2, Thomas Vosegaard1

  • 1Center for Ultrahigh-Field NMR Spectroscopy, Interdisciplinary Nanoscience Center (iNANO), Aarhus University, DK-8000 Aarhus, Denmark; Department of Chemistry, Aarhus University, DK-8000 Aarhus, Denmark.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|June 14, 2016
PubMed
Summary
This summary is machine-generated.

A new, affordable single-crystal Nuclear Magnetic Resonance (NMR) kit and software were developed. This system enables precise crystal orientation for accurate measurement of anisotropic quadrupolar interactions.

Keywords:
3D printGoniometerJavaScriptPiezo motorSingle-crystal NMRjsNMR

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Materials Science
  • Crystallography

Background:

  • Precise crystal orientation is crucial for solid-state NMR studies of anisotropic interactions.
  • Existing methods for single-crystal NMR can be complex and expensive.

Purpose of the Study:

  • To develop a low-cost, user-friendly single-crystal NMR kit.
  • To create accompanying software for automated data processing and analysis.

Main Methods:

  • Integration of a piezo-crystal motor and goniometer within a standard wide-bore NMR probe using a 3D-printed scaffold.
  • Automated NMR pulse program for crystal angle control.
  • Web-based post-processing software to correct for orientation-angle discrepancies.

Main Results:

  • The developed kit demonstrates high reproducibility in crystal orientation.
  • Results for a sodium nitrate (NaNO3) single-crystal show excellent agreement with established findings.
  • The system effectively accounts for orientation-angle variations inherent in single-crystal setups.

Conclusions:

  • The low-cost single-crystal NMR kit provides an accessible and reliable method for studying anisotropic interactions.
  • The integrated software enhances data accuracy and simplifies the analysis of solid-state NMR experiments.