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¹H NMR of Labile Protons: Temporal Resolution01:10

¹H NMR of Labile Protons: Temporal Resolution

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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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Photochemical Electrocyclic Reactions: Stereochemistry01:26

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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π Electron Effects on Chemical Shift: Overview01:27

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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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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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Mass Spectrometry: Alcohol Fragmentation01:03

Mass Spectrometry: Alcohol Fragmentation

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Alcohols (R-OH) ionize to lose one non-bonded electron from the oxygen atom, forming molecular ions. Due to their tendency to fragment rapidly, the intensity of the molecular ion peak in the mass spectrum is weak or sometimes absent. The fragmentation patterns for alcohols occur in two ways, i.e. ⍺-cleavage and dehydration. During ⍺-cleavage, the bond at the ⍺-position adjacent to the hydroxyl group cleaves to give a resonance-stabilized cation and a radical. However,...
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Tracing Photoinduced Hydrogen Migration in Alcohol Dications from Time-Resolved Molecular-Frame Photoelectron Angular

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  • 1Department of Physics, University of Toyama, Gofuku 3190, Toyama 930-8555, Japan.

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Researchers used theoretical calculations to visualize hydrogen migration in alcohol molecules after X-ray irradiation. Changes in photoelectron angular distributions reveal molecular dynamics, offering insights into chemical reactions.

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Area of Science:

  • Physical Chemistry
  • Chemical Physics
  • Molecular Dynamics

Background:

  • Advanced X-ray pump/X-ray probe techniques enable high-resolution molecular dynamics studies.
  • Free-electron laser facilities provide unprecedented temporal and spatial resolution for observing ultrafast processes.

Purpose of the Study:

  • To investigate hydrogen migration dynamics in alcohol dications using theoretical calculations.
  • To demonstrate the utility of polarization-averaged molecular-frame photoelectron angular distributions (PA-MFPADs) for visualizing molecular motion.

Main Methods:

  • Theoretical calculations of PA-MFPADs for methanol, ethanol, propanol, and isopropyl alcohol dications.
  • Analysis of changes in PA-MFPADs with pump-probe delay to track hydrogen migration.
  • Experimental validation using ion-ion coincidence measurements on ethanol-OD.

Main Results:

  • PA-MFPADs effectively visualize hydrogen migration dynamics in alcohol dications.
  • Intramolecular photoelectron diffraction patterns correlate with hydrogen migration pathways.
  • Hydrogen migration signatures were identified in methanol, ethanol, propanol, and isopropyl alcohol.

Conclusions:

  • PA-MFPADs are a powerful tool for real-space visualization of ultrafast hydrogen migration in molecules.
  • Experimental realization is feasible with current X-ray free-electron laser capabilities.
  • The study provides a pathway for future experimental investigations into molecular dynamics.