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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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.
Spin decoupling is usually achieved by...
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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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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Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

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In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
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2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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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.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
336
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

1.9K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
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Maximizing efficiency of dipolar recoupling in solid-state NMR using optimal control sequences.

Zdeněk Tošner1, Matthias J Brandl2, Jan Blahut1

  • 1Department of Chemistry, Faculty of Science, Charles University, Albertov 6, 12842 Prague, Czech Republic.

Science Advances
|October 13, 2021
PubMed
Summary
This summary is machine-generated.

Optimal control experiments enhance nuclear magnetic resonance (NMR) spectroscopy efficiency in solids. By synchronizing pulse parameters with sample rotation, these sequences adapt to various magic angle spinning (MAS) frequencies, improving applicability across different magnetic fields.

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Quantum Control Theory

Background:

  • Dipolar recoupling is crucial for establishing nuclear correlations in solid-state NMR.
  • Conventional cross-polarization methods suffer from low efficiency due to radio frequency (rf) field inhomogeneity and large chemical shift anisotropies in magic angle spinning (MAS) experiments.
  • Optimal control (OC) derived experiments offer high transfer efficiencies but traditionally require reoptimization for each MAS frequency.

Purpose of the Study:

  • To develop a method for applying optimal control sequences over a range of MAS frequencies without reoptimization.
  • To enhance the applicability of OC-derived experiments in solid-state NMR spectroscopy.

Main Methods:

  • Synchronous adjustment of shaped pulse length and rf field amplitude with sample rotation.
  • Application of OC sequences across varying MAS frequencies.

Main Results:

  • Demonstrated successful application of OC sequences over a range of MAS frequencies.
  • Eliminated the need for reoptimization for different MAS frequencies.
  • Significantly enhanced the applicability of OC experiments on spectrometers with variable external fields.

Conclusions:

  • Synchronous pulse control enables robust and widely applicable OC sequences for solid-state NMR.
  • This approach overcomes limitations of previous OC methods, improving efficiency and accessibility.
  • The findings facilitate broader use of advanced NMR techniques in materials science and chemistry.