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Related Experiment Videos

Electron delocalization and dimerization in solid C59N doped C60 fullerene.

A Rockenbauer1, Gábor Csányi, F Fülöp

  • 1Chemical Research Center, Institute of Chemistry, P.O. Box 17 H-1525 Budapest, Hungary.

Physical Review Letters
|March 24, 2005
PubMed
Summary

Molecular rotation and chemical bonding in dilute solid solutions were studied. Below 350 K, rigid C59N-C60 heterodimers form, influencing electron spin transfer between molecules.

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Area of Science:

  • Solid-state chemistry
  • Physical chemistry
  • Computational chemistry

Background:

  • Understanding molecular dynamics and bonding in solid solutions is crucial for materials science.
  • The behavior of unpaired electrons in complex molecular systems influences their properties.

Purpose of the Study:

  • To investigate the relationship between molecular rotation and chemical bonding in dilute C59N-C60 solid solutions.
  • To elucidate the temperature-dependent localization and delocalization of unpaired electrons.
  • To explore the formation and dynamics of C59N-C60 heterodimers.

Main Methods:

  • Electron spin resonance (ESR) spectroscopy was employed to study the electron spin.
  • Ab initio electronic structure calculations were performed to model molecular behavior and bonding.

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  • Temperature-dependent studies were conducted to observe phase transitions and molecular dynamics.

    • Main Results:

    • Above 700 K, the unpaired electron of C59N delocalizes over multiple C60 molecules.
    • Below 350 K, rigid C59N-C60 heterodimers form in equilibrium with dissociated molecules.
    • Structural fluctuations between heterodimers and dissociated molecules correlate with electron spin transfer between C60 and C59N.

    Conclusions:

    • A strong link exists between molecular rotation, chemical bonding, and electron spin dynamics in these systems.
    • The C59N-C60 heterodimer formation significantly alters spin density distribution, favoring C60 in the dimer and C59N when dissociated.