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Related Concept Videos

NMR Spectroscopy: Chemical Shift Overview01:15

NMR Spectroscopy: Chemical Shift Overview

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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.
For instance, the proton...
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Chemical Shift: Internal References and Solvent Effects01:17

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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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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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Double Resonance Techniques: Overview01:12

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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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π Electron Effects on Chemical Shift: Overview01:27

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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Other Nuclides: 31P, 19F, 15N NMR01:16

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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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Interaction frames in solid-state NMR: A case study for chemical-shift-selective irradiation schemes.

Matías Chávez1, Matthias Ernst1

  • 1Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093, Zürich, Switzerland.

Solid State Nuclear Magnetic Resonance
|November 3, 2022
PubMed
Summary
This summary is machine-generated.

Choosing the right interaction frame simplifies magnetic resonance experiments by eliminating dominant Hamiltonian terms. This study explores different frame choices for frequency-selective dipolar recoupling, detailing their pros and cons.

Keywords:
Chemical-shift-selective recouplingFloquet theoryInteraction framesMagic-angle spinningSolid-state NMR

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Area of Science:

  • Magnetic Resonance Spectroscopy
  • Quantum Mechanics in Chemistry
  • Physical Chemistry

Background:

  • Interaction frames are crucial for simplifying complex Hamiltonians in magnetic resonance.
  • They are used to eliminate dominant terms like the Zeeman or radio-frequency (rf) field Hamiltonian.
  • Transforming into an interaction frame can stabilize time-dependent parts of the Hamiltonian.

Purpose of the Study:

  • To analyze the impact of different interaction frame choices on magnetic resonance experiments.
  • To compare the advantages and disadvantages of various interaction frames.
  • To illustrate these concepts using frequency-selective dipolar recoupling sequences.

Main Methods:

  • The study discusses the theoretical framework of interaction frames in magnetic resonance.
  • It analyzes Hamiltonians in different interaction frames, including those with and without chemical shifts or effective fields.
  • Frequency-selective dipolar recoupling serves as a practical example for comparison.

Main Results:

  • Different interaction frames offer varying levels of simplification and insight into spin dynamics.
  • The choice of frame can affect the convergence of theoretical methods like average Hamiltonian or Floquet theory.
  • The complete radio-frequency Hamiltonian is always present, but inclusion of chemical shifts and effective fields varies.

Conclusions:

  • Selecting an appropriate interaction frame is critical for efficient experimental design and data interpretation in magnetic resonance.
  • Understanding the trade-offs between different frames allows for optimization of specific experiments, such as dipolar recoupling.
  • No single interaction frame is universally optimal; the best choice depends on the experimental goals.