Isomerization of linear C3H 3 (+) in its reaction with acetylene, and collisional stabilization of the [C5H 5 (+) ] (*) collision complex in a quadrupole ion trap mass spectrometer.
The isomerization of linear C3H 3 (+) in its reaction with acetylene to cyclic C3H 3 (+) was studied with a quadrupole ion trap mass spectrometer. The reaction of linear C3H 3 (+) with (13)C2H2 shows that isomerization takes place via a [C5H 5 (+) ](*) activated complex that is unstable relative to disproportionation back into the cyclic and linear forms of C3H 3 (+) and acetylene. The formation of carbon-13 labeled cyclic and linear C,Hi indicates that isomerization involves skeletal exchange. Collisional stabilization of the [C5H 5 (+) ](*) collision complex was achieved at a helium pressure of approximately 1 mtorr.
Department of Chemistry and Biochemistry, University of Texas at Austin, 78712, Austin, TX.
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Moini