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Infrared Fingerprint of Protonated Benzene in the Gas Phase

2003; Wiley; Volume: 42; Issue: 18 Linguagem: Inglês

10.1002/anie.200250708

1521-3773

W. J. Jones, Pierre Boissel, Barbara Chiavarino, Maria Elisa Crestoni, Simonetta Fornarini, Joël Lemaire, Philippe Maı̂tre,

Molecular Spectroscopy and Structure

A σ and not a π complex has been identified for the prototypical arenium intermediate, protonated benzene. The activation of the infrared multiphoton dissociation of C6H7+ ions (obtained by the gas-phase protonation of benzene) by the absorption of free electron laser radiation shows a wavelength-dependent dissociation of H2 (see spectrum) that matches the transitions calculated for the σ complex benzenium ion.