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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.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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

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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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2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

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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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NMR Spectroscopy: Spin–Spin Coupling01:08

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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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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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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.
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...
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Pure in-phase heteronuclear correlation NMR experiments.

Laura Castañar1, Josep Saurí, Robert Thomas Williamson

  • 1Servei de RMN and Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra (Spain).

Angewandte Chemie (International Ed. in English)
|June 26, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces a new nuclear magnetic resonance (NMR) method for pure in-phase (PIP) multiplets in heteronuclear correlation experiments. This technique effectively removes distortions, simplifying the analysis of complex molecular structures.

Keywords:
HSQCHSQMBCcoupling constantsheteronuclear long-range correlationpure in-phase NMR

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Structural Elucidation
  • Analytical Chemistry

Background:

  • Heteronuclear correlation experiments often suffer from distorted multiplet patterns due to anti-phase contributions.
  • These distortions in cross-peak analysis complicate the extraction of crucial structural information, such as coupling constants.

Purpose of the Study:

  • To develop a general nuclear magnetic resonance (NMR) approach for obtaining pure in-phase (PIP) multiplets in heteronuclear correlation experiments.
  • To suppress unwanted anti-phase contributions that typically distort cross-peak multiplet patterns and hinder analysis.

Main Methods:

  • Implementation of a zero-quantum filter within the NMR experiment.
  • Application of the developed method to heteronuclear single quantum multiple bond correlation (HSQMBC) experiments.

Main Results:

  • Efficient suppression of anti-phase contributions was achieved, leading to clean multiplet patterns.
  • The pure in-phase multiplets facilitate direct extraction of coupling constants from resolved signals.
  • The method supports peak-fitting processes using reference signals and enables the application of the IPAP technique for non-resolved multiplets.

Conclusions:

  • The described general NMR approach provides pure in-phase multiplets, significantly improving the analysis of heteronuclear correlation spectra.
  • This method enhances the accuracy of coupling constant determination and broadens the applicability of advanced NMR techniques like IPAP.