title: Infrared spectroscopy of gas phase C3H5+ : the allyl and 2-propenyl cations.
abstract: C3H5+ cations are probed with infrared photodissociation spectroscopy in the 800-3500 cm(-1) region using the method of rare gas tagging. The ions and their complexes with Ar or N2 are produced in a pulsed electric discharge supersonic expansion cluster source. Two structural isomers are characterized, namely, the allyl (CH2CHCH2+) and 2-propenyl (CH3CCH2+) cations. The infrared spectrum of the allyl cation confirms previous theoretical and condensed phase studies of the C(2nu) charge delocalized, resonance-stabilized structure. The 2-propenyl cation spectrum is consistent with a C(s) symmetry structure having a nearly linear CCC backbone and a hyperconjugatively stabilizing methyl group.
authors.affiliation: Department of Chemistry, University of Georgia, Athens, Georgia 30602-2556, USA.
authors.forename: Gary E
authors.initials: GE
authors.lastname: Douberly
authors.forename: Allen M
authors.initials: AM
authors.lastname: Ricks
authors.forename: Paul V R
authors.initials: PV
authors.lastname: Schleyer
authors.forename: Michael A
authors.initials: MA
authors.lastname: Duncan