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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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Molecular Orbital Theory II03:51

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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Comprehensive Analysis of Deuterium Isotope Effects on Ionic H3O+…π Interactions Using Multi-Component Quantum

Taro Udagawa1, Yusuke Kanematsu2, Takayoshi Ishimoto2

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|December 20, 2024
PubMed
Summary

Replacing hydrogen with deuterium in hydronium ions (H3O+) alters interaction energies and structures in complexes. Deuterium substitution significantly impacts O-H(D)...π interactions, affecting complex stability and geometry.

Keywords:
H/D isotope effectsOH…π interactionnatural energy decomposition analysisnuclear quantum effects

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Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Quantum Chemistry

Background:

  • Proton and deuteron quantum effects influence molecular interactions.
  • Hydronium ion (H3O+) complexes with unsaturated hydrocarbons exhibit O-H(D)...π bonding.
  • Understanding isotope effects is crucial for accurate molecular modeling.

Purpose of the Study:

  • To analyze deuterium isotope effects on interaction energies and geometries.
  • To investigate H3O+(D3O+)...alkene and H3O+(D3O+)...alkyne complexes.
  • To elucidate the role of nuclear quantum effects in these systems.

Main Methods:

  • Multi-component molecular orbital (MC-MP2) method incorporating nuclear quantum effects.
  • MP2 level of theory for electronic structure calculations.
  • Natural energy decomposition analysis (NEDA) for interaction energy components.

Main Results:

  • Deuterium substitution (D3O+) reduced interaction energies compared to H3O+.
  • Geometrical parameters of the complexes were altered by deuterium replacement.
  • A strong correlation was found between H/D isotope effects on distances and energy components.

Conclusions:

  • Nuclear quantum effects, particularly H/D isotope effects, significantly influence non-covalent interactions.
  • MC-MP2 calculations accurately capture these subtle effects.
  • Findings provide insights into the behavior of protonated and deuterated species in chemical systems.