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Related Concept Videos

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The protons in unsubstituted alkanes are strongly shielded with chemical shifts below 1.8 ppm. Methine, methylene, and methyl protons appear at approximately 1.7, 1.2 and 0.7 ppm, while the proton signal from methane appears at 0.23 ppm. An electronegative substituent, such as chlorine, withdraws the electron density from the protons, increasing their chemical shift. Progressive substitution of the hydrogens in methane by chlorine shifts the proton signals increasingly downfield, to 3.05 ppm in...
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Spatial Separation of Molecular Conformers and Clusters
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Microsolvation-induced quantum localization in protonated methane.

Alexander Witt1, Sergei D Ivanov, Dominik Marx

  • 1Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, 44780 Bochum, Germany.

Physical Review Letters
|March 12, 2013
PubMed
Summary
This summary is machine-generated.

Nuclear quantum effects drive proton scrambling in protonated methane (CH5+). External perturbations like microsolvation can halt or slow this dynamic process, revealing new mechanisms at low temperatures.

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Area of Science:

  • Physical Chemistry
  • Quantum Chemistry
  • Chemical Dynamics

Background:

  • Protonated methane (CH5+) exhibits significant nuclear quantum effects.
  • These effects lead to large-amplitude motion and "hydrogen scrambling," where all protons become dynamically equivalent.
  • The influence of external factors on this quantum fluxional state is not well understood.

Purpose of the Study:

  • To investigate the impact of external perturbations on the hydrogen scrambling dynamics of CH5+.
  • To explore how microsolvation affects the quantum fluxional ground state of CH5+.
  • To elucidate the mechanisms behind the cessation or slowdown of hydrogen scrambling.

Main Methods:

  • Ab initio path integral simulations were employed.
  • Simulations were performed on CH5+ solvated with n = 1, 2, 3 hydrogen molecules (CH5+(H2)n).
  • The study analyzed dynamics at low (20 K) and moderate (110 K) temperatures.

Main Results:

  • Hydrogen scrambling in CH5+ ceases at low temperatures (20 K) under microsolvation.
  • Scrambling dynamics slow down but do not cease at moderate temperatures (110 K).
  • Distinct microsolvation patterns were identified as responsible for freezing the scrambling dynamics.

Conclusions:

  • Microsolvation significantly alters the hydrogen scrambling dynamics of CH5+.
  • Unexpected mechanisms related to solvation patterns are responsible for inhibiting quantum fluxionality.
  • These findings offer new insights into the behavior of small protonated molecules in condensed phases.