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Related Concept Videos

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

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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...
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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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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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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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¹H NMR: Complex Splitting01:13

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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.
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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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Hyperpolarized Xenon for NMR and MRI Applications
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Quantification in Hyperpolarized NMR.

Arnab Dey1, Narayanan Chandrakumar1

  • 1MRI-MRS Centre, Department of Chemistry, Indian Institute of Technology Madras , Chennai 600036, Tamil Nadu, India.

The Journal of Physical Chemistry Letters
|February 13, 2016
PubMed
Summary
This summary is machine-generated.

This study reveals that measured hyperpolarized NMR signal enhancements can differ from actual polarization enhancements. Formulas are provided to accurately calculate real enhancements from apparent values, crucial for various NMR applications.

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Quantum Sensing

Background:

  • Hyperpolarized Nuclear Magnetic Resonance (NMR) offers enhanced sensitivity for detecting low-concentration analytes.
  • Accurate quantification of polarization enhancement is critical for reliable analytical results in NMR.
  • Existing methods may not fully account for factors influencing measured signal intensity.

Purpose of the Study:

  • To theoretically and experimentally analyze the quantitative aspects of hyperpolarized NMR.
  • To investigate the discrepancy between measured "apparent" signal enhancements and real polarization enhancements.
  • To provide methods for calculating true polarization values from observed data.

Main Methods:

  • Theoretical analysis of quantitative hyperpolarized NMR.
  • Experimental validation across different magnetic field strengths and probe Q-factors.
  • Development of expressions relating apparent and real polarization enhancements based on spin count.

Main Results:

  • Demonstrated significant deviations between apparent and real polarization enhancements in hyperpolarized NMR.
  • Derived expressions to interconvert between apparent and real enhancements using spin count.
  • Confirmed the relevance of these findings for both high-field/high-Q and low-to-moderate field/moderate-Q scenarios.

Conclusions:

  • The quantitative interpretation of hyperpolarized NMR signals requires careful consideration of "apparent" versus real polarization enhancements.
  • The derived formulas enable accurate determination of polarization levels, improving analytical precision.
  • These findings are broadly applicable, enhancing the utility of hyperpolarized NMR across diverse experimental setups.