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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
Summary
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.
- 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.