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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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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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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 (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: Overview of Heteronuclear Correlation Techniques01:18

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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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Extracting Scalar Couplings From Complex 1H NMR Spectra Using a Simple 2D J-Resolved Sequence.

Manjeet Mudgil1, Narayanan D Kurur1

  • 1Department of Chemistry, Indian Institute of Technology Delhi, New Delhi, India.

Magnetic Resonance in Chemistry : MRC
|September 19, 2024
PubMed
Summary

This study introduces a new 2D J-resolved nuclear magnetic resonance (NMR) sequence for measuring scalar couplings. The method simplifies complex spectra, enabling easier analysis of proton-proton couplings in challenging chemical and biological samples.

Keywords:
J‐resolved spectroscopySERF sequencesscalar couplingssinglet orderstructural and conformational analysis

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Area of Science:

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

Background:

  • Measuring scalar couplings between protons is difficult due to complex and overlapping signals in 1D NMR spectra.
  • Existing 2D J-resolved sequences often require specialized elements (e.g., Zangger-Sterk, PSYCHE, z-filter) and pure-shift schemes.

Purpose of the Study:

  • To develop a simplified 2D J-resolved NMR sequence for accurate measurement of scalar couplings.
  • To provide a method for obtaining clean, high-resolution spectra from congested samples.

Main Methods:

  • A novel 2D J-resolved sequence employing a basic element of hard pulses and delays was designed.
  • Selective refocusing and the simple element were used to eliminate unwanted spectral components.
  • The sequence generates phase-sensitive spectra with simplified doublets and full multiplets.

Main Results:

  • The developed sequence effectively eliminates axial peaks and other artifacts, yielding clean spectra.
  • It allows for the selective observation of couplings between two targeted protons.
  • The method simplifies spectral analysis, even in highly congested regions.

Conclusions:

  • The new sequence offers an easier implementation for extracting coupling values from crowded NMR spectra.
  • This technique is expected to be a valuable tool for structural and conformational analysis in chemistry and biology.