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Related Concept Videos

2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

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

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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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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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Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
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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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Quadrupolar Isotope-Correlation Spectroscopy in Solid-State NMR.

Tamar Wolf1, Michael J Jaroszewicz1, Lucio Frydman1

  • 1Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot 7610001, Israel.

The Journal of Physical Chemistry. C, Nanomaterials and Interfaces
|June 17, 2022
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Summary
This summary is machine-generated.

This study introduces two-dimensional QUadrupolar Isotope Correlation SpectroscopY (QUICSY) for static solid-state NMR. This method enhances spectral resolution for quadrupolar nuclei, improving structural characterization.

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Materials characterization and structural analysis.
  • Quantum chemistry and spectroscopy.

Background:

  • Quadrupolar solid-state NMR provides structural insights via local coupling parameters.
  • Current methods struggle with large quadrupolar coupling (C_Q) values under static conditions.
  • Static acquisitions are often preferred for large C_Q, but extracting information is challenging.

Purpose of the Study:

  • To explore the utility of 2D QUadrupolar Isotope Correlation SpectroscopY (QUICSY) experiments.
  • To increase NMR spectral resolution for quadrupolar nuclei under static conditions.
  • To enrich the characterization of quadrupolar NMR patterns with large quadrupolar effects.

Main Methods:

  • Development and application of 2D QUICSY experiments.
  • Correlation of solid-state NMR powder line shapes for two isotopes of the same element.
  • Theoretical analysis and experimental validation using rubidium-containing salts (RbClO4 and Rb2SO4).

Main Results:

  • QUICSY generates sharp "ridges" in 2D correlations, even for static samples with broad line shapes.
  • Distinctive 2D QUICSY line shapes were observed for RbClO4 and Rb2SO4.
  • Experimental line shapes showed good agreement with analytical derivations based on literature tensor values.

Conclusions:

  • 2D QUICSY effectively enhances spectral resolution and structural characterization of quadrupolar nuclei under static conditions.
  • The method is applicable to elements with recurrent quadrupolar isotope pairs (e.g., Cl, Ga, Br, Rb).
  • This approach offers a pathway for improved analysis of wideline NMR spectra for quadrupolar nuclei.