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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

328
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...
328
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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

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

¹H NMR: Complex Splitting

1.4K
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...
1.4K
Proton (¹H) NMR: Chemical Shift01:07

Proton (¹H) NMR: Chemical Shift

2.0K
Organic molecules primarily contain carbon and hydrogen atoms. While all the hydrogen isotopes are NMR-active, protium or hydrogen-1 is the most abundant. It has a significant energy separation between its nuclear spin states due to its large gyromagnetic ratio. As per Boltzmann's distribution, an increase in the energy separation implies a greater excess population of nuclei available for excitation, resulting in a strong NMR absorption signal.
Absorption signals of all the protium nuclei...
2.0K
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 of Labile Protons: Deuterium (²H) Substitution00:48

¹H NMR of Labile Protons: Deuterium (²H) Substitution

995
This lesson illustrates the role of deuterium substitution in simplifying the NMR spectrum of compounds comprising labile protons. One method employed is the use of deuterium. Amongst the three isotopes of hydrogen, deuterium (2H) has a nucleus composed of one proton and one neutron. When the D2O solvent is added to a pure dry ethanol solution, its labile proton is substituted with deuterium.
995

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Related Experiment Video

Updated: Sep 30, 2025

Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method

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Cavity-Modulated Proton Transfer Reactions.

Fabijan Pavošević1, Sharon Hammes-Schiffer2, Angel Rubio1,3,4

  • 1Center for Computational Quantum Physics, Flatiron Institute, 162 Fifth Avenue, 10010 New York, New York, United States.

Journal of the American Chemical Society
|March 10, 2022
PubMed
Summary
This summary is machine-generated.

Controlling proton transfer rates via strong light-matter coupling in optical cavities offers new quantum technology possibilities. This study demonstrates altering proton transfer barriers in molecules using quantum electrodynamics methods.

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Area of Science:

  • Quantum Chemistry
  • Chemical Physics
  • Materials Science

Background:

  • Proton transfer is crucial in chemical and biological systems.
  • Modulating proton transfer rates could advance quantum technologies.
  • Strong light-matter coupling in optical cavities is a potential control mechanism.

Purpose of the Study:

  • To investigate the effect of optical cavities on proton transfer reactions.
  • To explore the modulation of reaction energy barriers using quantum electrodynamics.
  • To establish light-matter coupling as a method for catalyzing proton transfer.

Main Methods:

  • Quantum electrodynamics coupled cluster theory.
  • Quantum electrodynamical density functional theory.
  • First-principles calculations on malonaldehyde and aminopropenal molecules.

Main Results:

  • Optical cavities can increase the reaction energy barrier by 10-20%.
  • Optical cavities can decrease the reaction barrier by approximately 5%.
  • The effect depends on the cavity mode polarization direction.

Conclusions:

  • Strong light-matter coupling provides a viable route to alter proton transfer rates.
  • This approach can be used to catalyze or inhibit proton transfer reactions.
  • Quantum electrodynamics methods are effective for studying these phenomena.