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Gas-phase ion/molecule reactions in C5F8.

K Hiraoka1, K Fujita, M Ishida

  • 1Clean Energy Research Center, University of Yamanashi, Takeda-4, Kofu 400-8511, Japan.

The Journal of Physical Chemistry. A
|July 13, 2006
PubMed
Summary
This summary is machine-generated.

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Octafluorocyclopentene (C5F8) exhibits weak electrostatic interactions with its ions and a positive electron affinity. Fluoride ions form strong bonds with C5F8, while other halide ions interact weakly.

Area of Science:

  • Physical Chemistry
  • Chemical Physics
  • Mass Spectrometry

Background:

  • Understanding ion-molecule reactions is crucial for various chemical processes.
  • Octafluorocyclopentene (C5F8) is a fluorinated cyclic alkene with unique electronic properties.

Purpose of the Study:

  • To investigate the gas-phase ion-molecule reactions of octafluorocyclopentene (C5F8).
  • To determine the bonding energies, proton affinity, and electron affinity of C5F8.
  • To elucidate the interaction mechanisms between C5F8 and various ions, including halide ions.

Main Methods:

  • Pulsed electron beam mass spectrometry was employed to study ion-molecule reactions.
  • Theoretical calculations using (U)B3LYP/6-311+G(d) were performed to support experimental findings.

Related Experiment Videos

  • Analysis of fragment ion formation and ion-ligand interactions was conducted.

    • Main Results:

    • Major fragment ions like C5F8+, C5F7+, C4F6+, C4F5+, and C3F3+ were identified.
    • Cation-C5F8 bonding energies were found to be around 10 kcal/mol.
    • C5F8 possesses a positive electron affinity of 1.27 eV.
    • Fluoride ions form strong covalent bonds with C5F8, while other halide ions interact weakly.
    • Proton affinity of C5F8 is lower than that of ethylene (C2H4).

    Conclusions:

    • C5F8 exhibits weak electrostatic interactions with its molecular ions.
    • The electron affinity of C5F8 suggests potential for negative ion chemistry.
    • Fluoride ion transfer plays a role in the complex ion formation involving C5F8.