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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

248
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...
248
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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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...
1.5K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.1K
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.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.1K
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

1.1K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.1K
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.1K
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...
1.1K
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

737
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...
737

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Solid-State NMR Double-Quantum Dipolar Recoupling Enhanced by Additional Phase Modulation.

Hang Xiao1,2, Zhengfeng Zhang1,3, Huimin Kang1

  • 1National Center for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, Hubei, 430071, China.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|June 13, 2023
PubMed
Summary

Additional phase modulation (APM) enhances solid-state NMR efficiency for homonuclear double-quantum (DQ) recoupling. This method improves theoretical efficiency by up to 30% and can reach near-perfect recoupling with optimization.

Keywords:
adiabatical process enhancementdouble-quantum homonuclear recouplingphase modulation, transfer efficiencysolid-state NMR

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy
  • Quantum information processing and control

Background:

  • Homonuclear double-quantum (DQ) recoupling is crucial for structural analysis in solid-state NMR.
  • Existing recoupling methods face limitations in theoretical efficiency and applicability across different recoupling schemes.

Purpose of the Study:

  • To introduce and evaluate Additional Phase Modulation (APM) as a novel technique to enhance homonuclear DQ recoupling efficiency.
  • To demonstrate the versatility of APM across various recoupling types, including γ-encoded and non-γ-encoded schemes.

Main Methods:

  • APM involves applying an additional phase list to DQ recoupling sequences.
  • Sine-based phase lists were investigated, alongside genetic-algorithm (GA) optimized APM for adiabatic enhancement.
  • The method was tested on model systems (SPR-5₁, BaBa, SPR-3₁) and validated experimentally using 2,3-¹³C labeled alanine.

Main Results:

  • Sine-based APM improved theoretical efficiency by 15-30%, reaching 0.68 for non-γ-encoded and 0.84 for γ-encoded recoupling.
  • GA-optimized APM achieved near-unity (∼1.0) efficiency at longer recoupling times.
  • Simulations indicated that APM enhances efficiency by activating a larger fraction of crystallites in a powder sample.

Conclusions:

  • APM represents a significant advancement in improving the efficiency of homonuclear DQ recoupling in solid-state NMR.
  • The method's effectiveness across different recoupling types and its validation in experimental settings highlight its potential.
  • APM offers a promising new direction for developing more powerful and efficient recoupling techniques in NMR spectroscopy.