Reactions of C3H3+ with Acetylene and Diacetylene in the Gas Phase

Article abstract of DOI:10.1021/j100300a029

The reactions of linear C3H3⁺ with acetylene, diacetylene, and deuteriated acetylene were investigated with a Fourier transform ion cyclotron resonance (FTICR) mass spectrometer.A rate coefficient of (1.4 +/- 0.7)E-9 cm³/s was obtained for the reaction of linear C3H3⁺ with diacetylene while no production of larger ions was observed with acetylene.The ejection capabilities of FTICR were used to study the reactions of different C3H3⁺ precursors with C2H2 in order to investigate the possible production of C5H5⁺ from ionic sources other than C3H3⁺ present in the reaction medium.Linear C3H3⁺ isomerized to the cyclic form in the reactions with both acetylene and diacetylene.The isomerization was shown to take place via a long-lived C5H5⁺ complex by isotope exchange reactions between linear C3H3⁺ and deuteriated acetylene.Results are discussed in relation to previous work involving C3H3⁺ reactions and a proposed ionic route to soot formation.