Termolecular ion–molecule reactions involving C₃H₅⁺

Abstract

The reaction of C3,H5+ with C2D4 to produce C5H5D4+ is shown to be second order in C2Dq The rate coefficients are in the range to cm6 molecule-2 s-' but decrease markedly with Increasing ion kinetic energy. This decrease reflects the effect of the ion kinetic energy on the lifetime of the initial collision complex. Small differences in rate coefficients are observed depending on the source of the C3HSf ion but these are insufficient to distinguish between possibly different ionic structures. The reaction of C3HSf with C2H3F forms C5H,+ in a reaction second order in C2H3F. The rate coefficients are also in the range to cm6 molecule-' s-' and show a similar dependence on ion kinetic energy. These high third order rate constants are compared with data for other termolecular reactions and are shown to be consistent with the effect of molecular size on the third order rate constant.

Third-order ion-molecule clustering reactions

“…The corresponding reaction of C3H5+ with C9D4 has been studied. 227 The rate constant was found to depend on repeller voltage and on the source of the C3H5+. At 0.64 eV, rate constants of 8.4, 14.1, 6.2, and 3.6(-25) were observed for cyclopropyl bromide, allyl bromide, 2-bromopropene, and 1-bromopropene precursors, respectively.…”