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Related Concept Videos

¹H NMR of Labile Protons: Deuterium (²H) Substitution00:48

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

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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.
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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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...
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¹H NMR of Labile Protons: Temporal Resolution01:10

¹H NMR of Labile Protons: Temporal Resolution

1.5K
Protons bonded to heteroatoms such as nitrogen and oxygen exhibit a range of chemical shift values. This is due to the varying degree of hydrogen bonding between the proton and the heteroatom in other molecules. The extent of hydrogen bonding affects the electron density around the proton, thereby giving different chemical shift values for the protons in the proton NMR spectrum.
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the specific...
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IR Spectrum Peak Broadening: Hydrogen Bonding01:23

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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.
However, the extent of hydrogen bonding influences the observed stretching frequency and band broadening. Intermolecular or intramolecular...
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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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

1.4K
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 Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
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Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy
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Probing Low-Energy Resonances in Water-Hydrogen Inelastic Collisions.

A Bergeat1, S B Morales1, C Naulin1

  • 1Université de Bordeaux, CNRS, Bordeaux INP, ISM, UMR5255, F-33405 Talence, France.

Physical Review Letters
|October 16, 2020
PubMed
Summary
This summary is machine-generated.

This study investigates molecular scattering dynamics of ortho-deuterated water (D2O) and para-hydrogen (H2) at low energies. Researchers observed and theoretically predicted resonance peaks in scattering cross sections, revealing insights into molecular interactions.

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Area of Science:

  • Chemical Physics
  • Molecular Dynamics
  • Quantum Scattering

Background:

  • Low-energy molecular collisions reveal detailed scattering dynamics.
  • Resonances in inelastic cross sections provide insights into intermolecular potentials.
  • Understanding molecular interactions is crucial for various chemical and physical processes.

Purpose of the Study:

  • To experimentally and theoretically investigate the rotationally inelastic scattering of ortho-D2O by para-H2.
  • To study the scattering dynamics in the threshold region of the D2O(000→202) transition.
  • To characterize resonance phenomena in polyatomic molecule-diatom collisions.

Main Methods:

  • Utilized a molecular crossed beam apparatus with variable collision energy.
  • Performed coupled-channel calculations using a high-level D2O-H2 intermolecular potential.
  • Analyzed scattering cross sections for the D2O(000→202) transition.

Main Results:

  • Observed resonance peaks in the inelastic cross sections that closely matched theoretical predictions.
  • Experimental and theoretical results agreed in the absolute positions and relative intensities of the resonance peaks.
  • Identified shape resonances as the primary cause of the observed peaks for this polyatomic molecule-diatom system.

Conclusions:

  • The study provides a detailed understanding of the rotationally inelastic scattering between D2O and H2 at low collisional energies.
  • The findings validate the accuracy of the theoretical model and the intermolecular potential used.
  • This work represents the first characterization of shape resonances in collisions involving a polyatomic molecule and a diatom.