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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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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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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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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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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other axis.

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HMQC and refocused-INEPT experiments involving half-integer quadrupolar nuclei in solids.

J P Amoureux1, J Trebosc, J Wiench

  • 1UCCS, CNRS-8181, ENSCL-USTL, Fr-59652 Villeneuve d'Ascq, France.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|October 10, 2006
PubMed
Summary

This study analyzes hetero-nuclear coherence transfers in solid-state NMR experiments for quadrupolar nuclei. Theoretical predictions for HMQC and INEPT sequences were experimentally verified under magic angle spinning (MAS).

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy
  • Quantum mechanics in condensed matter

Background:

  • Hetero-nuclear coherence transfer is crucial for sensitive NMR detection.
  • Half-integer quadrupolar nuclei present unique challenges in solid-state NMR due to their quadrupole moments.
  • Existing methods like HMQC and INEPT require careful optimization for quadrupolar nuclei.

Purpose of the Study:

  • To theoretically analyze hetero-nuclear coherence transfers in HMQC and refocused-INEPT experiments.
  • To investigate these transfers for half-integer quadrupolar nuclei in solids under MAS.
  • To validate theoretical predictions with experimental data.

Main Methods:

  • Theoretical analysis of 1D and 2D NMR pulse sequences.
  • Consideration of general multi-spin systems SI(n) (n>=4) under MAS.
  • Experimental verification using 1D and 2D NMR experiments at high magnetic fields (9.4 and 18.8T).
  • Discussion in the context of advanced techniques like MQMAS and STMAS.

Main Results:

  • Detailed analysis of coherence transfer pathways for quadrupolar nuclei.
  • Demonstration of the applicability of HMQC and INEPT sequences to these challenging nuclei.
  • Experimental validation of theoretical predictions across different field strengths.
  • Insights into optimizing pulse sequences for enhanced sensitivity and resolution.

Conclusions:

  • The study provides a robust theoretical framework for understanding coherence transfer in solid-state NMR of quadrupolar nuclei.
  • Experimental results confirm the validity and utility of the analyzed pulse sequences.
  • The findings contribute to the advancement of high-resolution solid-state NMR techniques for complex materials.