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Switching on H-Tunneling through Conformational Control.

José P L Roque1, Cláudio M Nunes1, Luís P Viegas1

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This summary is machine-generated.

Researchers demonstrate controlling hydrogen tunneling (H-tunneling) using external radiation. By altering molecular conformation with light, they triggered spontaneous H-tunneling, offering a new strategy for chemical manipulation.

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Area of Science:

  • Quantum chemistry
  • Chemical physics
  • Materials science

Background:

  • Hydrogen tunneling (H-tunneling) is a fundamental quantum mechanical process observed across diverse scientific disciplines.
  • Controlling H-tunneling for targeted chemical transformations remains a significant challenge in chemistry and materials science.

Purpose of the Study:

  • To demonstrate a novel method for actively controlling H-tunneling using external radiation.
  • To investigate the mechanism of radiation-induced conformational changes that facilitate H-tunneling.

Main Methods:

  • Generation of a triplet 2-hydroxyphenylnitrene intermediate in a nitrogen (N2) matrix at low temperatures (10 K) via UV irradiation of an azide precursor.
  • Selective vibrational excitation at the 2ν(OH) frequency to induce conformational changes from anti- to syn-orientation of the hydroxyl (OH) moiety.
  • Spectroscopic analysis and computational modeling to elucidate the H-tunneling pathway and energy landscape.

Main Results:

  • External radiation successfully induced a conformational change in the 2-hydroxyphenylnitrene, bringing the hydrogen atom closer to the nitrene center.
  • This conformational shift triggered spontaneous H-tunneling from the triplet nitrene to a singlet 6-imino-2,4-cyclohexadienone product.
  • Computational studies confirmed that the H-tunneling proceeds via crossing of triplet-to-singlet potential energy surfaces.

Conclusions:

  • The study presents a groundbreaking experimental strategy to control H-tunneling through conformational manipulation via external radiation.
  • This work opens new possibilities for directing chemical reactions and manipulating molecular structures by harnessing quantum tunneling effects.