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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

283
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...
283
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

1.4K
In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
1.4K
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

838
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....
838
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.1K
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...
1.1K
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.2K
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...
1.2K
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

1.3K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
1.3K

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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
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A one-shot double-slice selection NMR method for biphasic systems.

Kaitlyn Doolittle Catlin1, Julia Simmons1, Shi Bai1

  • 1Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716, USA. bais@udel.edu.

Physical Chemistry Chemical Physics : PCCP
|July 26, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a novel one-shot double-slice selection experiment for simultaneously detecting proton (1H) NMR signals in biphasic systems. The method generates opposite-phased peaks, clearly distinguishing chemical species in each phase.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Physical Chemistry

Background:

  • Biphasic systems present challenges in simultaneous chemical species analysis.
  • Proton Nuclear Magnetic Resonance (1H NMR) is a powerful tool for chemical analysis.
  • Existing NMR methods may require complex setups or multiple experiments for biphasic systems.

Purpose of the Study:

  • To develop a robust and efficient method for simultaneous 1H NMR signal detection in biphasic systems.
  • To introduce a one-shot experiment that simplifies the analysis of complex mixtures.
  • To enable clear differentiation of chemical species residing in distinct phases.

Main Methods:

  • Implementation of a novel one-shot double-slice selection pulse sequence.
  • Application of the method to biphasic systems.
  • Analysis of the resulting 1H NMR spectra.

Main Results:

  • Successful simultaneous detection of 1H NMR signals from both phases of a biphasic system.
  • Generation of spectra with opposite-phased peaks, uniquely identifying species in each phase.
  • Demonstration of the robustness and efficiency of the proposed method.

Conclusions:

  • The one-shot double-slice selection experiment is a viable and effective technique for analyzing biphasic systems using 1H NMR.
  • This method offers a simplified approach to distinguishing chemical species in different phases.
  • The technique holds potential for advancing the study of complex chemical and biological systems.