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Preparation and Characterization of C60/Graphene Hybrid Nanostructures
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Can H2 inside C60 communicate with the outside world?

Juan López-Gejo1, Angel A Martí, Marco Ruzzi

  • 1Department of Chemistry, Columbia University, New York, New York 10027, USA.

Journal of the American Chemical Society
|November 8, 2007
PubMed
Summary

Fullerene encapsulation of hydrogen or deuterium did not affect triplet lifetimes. However, encapsulated H2 and D2 significantly influenced singlet oxygen quenching rates, showing vibrational interactions.

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Area of Science:

  • Photochemistry
  • Physical Chemistry
  • Materials Science

Background:

  • Singlet oxygen (1O2) is a reactive oxygen species implicated in various chemical and biological processes.
  • Fullerenes, such as C60, are known quenchers of singlet oxygen.
  • Encapsulating small molecules within fullerenes can modify their properties.

Purpose of the Study:

  • To investigate the effect of encapsulated hydrogen (H2) and deuterium (D2) within C60 on singlet oxygen quenching.
  • To compare the quenching efficiencies of C60, H2@C60, D2@C60, H2, and D2.
  • To elucidate the role of vibrational interactions in the quenching mechanism.

Main Methods:

  • Measurement of quenching rate constants for singlet oxygen using various quenchers in solution.
  • Generation of singlet oxygen via photosensitization and thermal decomposition of naphthalene endoperoxide derivatives.
  • Utilizing triplet lifetime and Electron Paramagnetic Resonance (EPR) measurements.

Main Results:

  • Encapsulation of H2 or D2 within C60 did not alter triplet lifetimes or show observable effects via EPR.
  • A significant effect was observed in singlet oxygen quenching by C60, H2@C60, D2@C60, H2, and D2.
  • The quenching rate constant for H2 was approximately one order of magnitude higher than that for D2.
  • Comparison of H2@C60 and D2@C60 revealed a notable vibrational interaction between singlet oxygen and the encapsulated H2 molecule.

Conclusions:

  • The vibrational modes of encapsulated H2 and D2 play a crucial role in the quenching of singlet oxygen by fullerene derivatives.
  • The observed kinetic isotope effect (H2 vs. D2) provides evidence for significant vibrational energy transfer during the quenching process.
  • Fullerene encapsulation offers a platform to study and potentially tune molecular interactions with reactive species like singlet oxygen.