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Related Concept Videos

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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IR Spectrum Peak Broadening: Hydrogen Bonding

The vibrational frequency of a bond is directly proportional to its bond strength. As a result, stronger bonds vibrate at higher frequencies, while weaker bonds vibrate at lower frequencies. The stretching vibration of the strong O–H bond in alcohols and phenols (very dilute solution or gas phase) appears as a sharp peak at 3600–3650 cm−1.
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Induced Electric Dipoles01:28

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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
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Hydrogen Bonds Control the World!
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A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...

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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Published on: August 6, 2018

Time domain para hydrogen induced polarization.

Tomasz Ratajczyk1, Torsten Gutmann, Sonja Dillenberger

  • 1Institute of Physical Chemistry, Technical University Darmstadt, Petersenstrasse 22, D-64287 Darmstadt, Germany.

Solid State Nuclear Magnetic Resonance
|February 28, 2012
PubMed
Summary

Para hydrogen induced polarization (PHIP) can now be detected at low magnetic fields using time-domain methods, overcoming resolution limitations. This advance expands hyperpolarization applications in fields like food science and low-field MRI.

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Hyperpolarization Techniques
  • Materials Science

Background:

  • Para hydrogen induced polarization (PHIP) significantly enhances NMR sensitivity but typically requires high magnetic field homogeneity.
  • Conventional PHIP schemes produce anti-phase signals, which are difficult to resolve at low magnetic fields or low spectral resolution.
  • Low-field NMR is prevalent in industrial and biomedical applications, but limited resolution hinders PHIP's utility.

Purpose of the Study:

  • To demonstrate the acquisition of low-resolution PHIP-enhanced NMR signals at a low magnetic field.
  • To adapt and compare time-domain PHIP methods (TD-PHIP) for low-field applications.
  • To explore new application areas for PHIP in low-field settings.

Main Methods:

  • Utilized an echo sequence (45°-τ-180°-τ) for acquiring PHIP-enhanced liquid-state NMR signals.
  • Employed time-domain data evaluation for two PHIP variants: TD-ALTADENA and TD-PASADENA.
  • Conducted solid-state NMR calculations for a solid echo variant of TD-ALTADENA.

Main Results:

  • Successfully detected strong spin echoes for phenylpropiolic acid derivatives and phenylacetylene at 0.54 T.
  • Acquired measurable PHIP-enhanced signals even under conditions of low spectral resolution where anti-phase signals are typically undetectable.
  • Solid-state NMR calculations indicate up to 10% signal conversion in the solid echo TD-ALTADENA variant.

Conclusions:

  • Time-domain detection of PHIP-enhanced signals overcomes low-field resolution limitations.
  • This approach broadens the applicability of PHIP in food science, materials science, and low-field MRI.
  • Opens possibilities for non-invasive compound detection and novel contrast agents/biomarkers in low-field MRI.