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Related Concept Videos

¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

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

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

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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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
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Published on: July 18, 2014

Probing polymer colloids by 129Xe NMR.

Emanuela Locci1, Patrice Roose, Kristin Bartik

  • 1Dipartimento di Scienze Chimiche, Università di Cagliari, Cittadella Universitaria di Monserrato, S.S.554 Bivio per Sestu, 09042 Monserrato (CA), Italy.

Journal of Colloid and Interface Science
|November 18, 2008
PubMed
Summary

Xenon NMR spectroscopy reveals distinct differences in polymer latexes below and above their glass transition temperatures. This technique offers insights into polymer particle core characteristics and surface properties by analyzing xenon interactions.

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Area of Science:

  • Polymer science
  • Materials science
  • Spectroscopy

Background:

  • Polymer latexes are widely used in various applications.
  • Understanding the properties of polymer particles is crucial for material performance.
  • Characterizing polymer particle surfaces and cores can be challenging.

Purpose of the Study:

  • To investigate the use of xenon NMR spectroscopy for characterizing polymer latexes.
  • To differentiate between polymer particle core and surface properties.
  • To explore the relationship between xenon NMR spectral features and polymer properties.

Main Methods:

  • Model aqueous dispersions of polystyrene, poly(methyl methacrylate), poly(n-butyl acrylate), and a copolymer were prepared.
  • Xenon-129 NMR spectroscopy was employed to study these latexes.
  • NMR spectra were analyzed at temperatures above and below the glass transition temperature.

Main Results:

  • Distinct (129)Xe NMR spectra, including variations in peak number, line width, and chemical shift, were observed for different latexes.
  • Above the glass transition temperature, fast xenon exchange resulted in a single NMR signal.
  • Below the glass transition temperature, slow xenon exchange yielded two signals, enabling characterization of the particle core.
  • The line width of free (129)Xe correlated with xenon penetration kinetics and polymer surface properties.

Conclusions:

  • Xenon NMR spectroscopy is a valuable tool for characterizing polymer latexes.
  • Spectral features provide quantitative and qualitative information about polymer particle cores.
  • (129)Xe NMR parameters offer insights into polymer particle surface characteristics and dynamics.