JMSSJ On-line

JMSSJ On-line, Vol. 45 (1997) No. 4, pp. 493-503

Mass-Spectrometric Study on Ion-Molecule Reactions of CF₃⁺ with Propyne, Allene, and 1-Butyne at Near-Thermal Energies		>> Full Text PDF >> References
*Masaharu TSUJI,^{a, b)} Masato AIZAWA,^b) Erika ODA,^b) and Yukio NISHIMURA^{a, b)}** ^a) Institute of Advanced Material Study, Kyushu University (Kasuga, Fukuoka 816, Japan)* ^b) Department of Molecular Science and Technology, Graduate School of Engineering Sciences (Kyushu University, Kasuga, Fukuoka 816, Japan)

Ion-molecule reactions of CF₃⁺ with propyne, allene, and 1-butyne have been studied at near-thermal energies (-0.05 eV) by using an ion-beam apparatus. Initial product ion distributions and reaction rate constants were determined. For propyne and allene, major product channels were electrophilic addition followed by HF and CF₂ elimination and a minor product channel was a hydride abstraction reaction. For 1-butyne, major product channels were electrophilic addition followed by C₂H₂F₂, C₂H₃F, and 2HF eliminations. The reaction rate constants were (1.5±0.1), (0.40±0.05), and (1.6±0.1)×10^-9 cm³s^-1 molecule^-1 for propyne, allene, and 1-butyne, respectively.

Key words: Ion-beam apparatus, Trifluoromethyl cation, Unsaturated aliphatic hydrocarbons, Ion-molecule reaction, Product ion distribution, Rate constant