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Related Concept Videos

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...
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

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

¹H NMR: Interpreting Distorted and Overlapping Signals

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 slanted or...
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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...
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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...
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse.

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Quantitative 2H NMR spectroscopy with 1H lock extender.

Carlo Vignali1, Augusta Caligiani, Gerardo Palla

  • 1Centro Interdipartimentale Misure, Università di Parma, Via Usberti 23A, 43100-Parma, Italy.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|May 9, 2007
PubMed
Summary

A new, affordable external unit enables deuterium (2H) observation using a proton (1H) lock on standard NMR spectrometers. This easy-to-use system offers a cost-effective alternative for isotopic ratio analysis.

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Analytical Chemistry
  • Isotope Ratio Mass Spectrometry

Background:

  • Commercial high-resolution NMR spectrometers typically require expensive configurations for specific isotopic observations.
  • Proton (1H) lock systems are common, but deuterium (2H) observation often necessitates specialized or costly setups.
  • Existing methods for isotopic ratio determination can be complex and expensive.

Purpose of the Study:

  • To describe an inexpensive external unit for deuterium (2H) observation using a proton (1H) lock on commercial NMR spectrometers.
  • To present a cost-effective and user-friendly alternative to existing (19F) lock configurations.
  • To demonstrate the application of this system for quantitative analysis of natural isotopic ratios.

Main Methods:

  • Development and implementation of an inexpensive external unit for NMR.
  • Utilizing a proton (1H) lock system for deuterium (2H) observation.
  • Application of the developed unit for quantitative determination of 2H/1H ratios in ethanol and acetic acid.

Main Results:

  • The external unit is inexpensive, requires no tuning, and is easy to operate.
  • The system successfully enables deuterium (2H) observation with a proton (1H) lock.
  • Quantitative determination of the natural isotopic ratio (2H/1H) for ethanol and acetic acid was achieved.

Conclusions:

  • The described external unit provides a cheaper and more straightforward method for deuterium (2H) observation in NMR spectroscopy.
  • This approach offers a practical solution for isotopic ratio analysis, particularly for natural abundance studies.
  • The system's ease of use and low cost make high-resolution NMR accessible for a wider range of applications.