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Infrared Fingerprint of Protonated Benzene in the Gas Phase
Author(s) -
Jones William,
Boissel Pierre,
Chiavarino Barbara,
Crestoni Maria Elisa,
Fornarini Simonetta,
Lemaire Joël,
Maitre Philippe
Publication year - 2003
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200250708
Subject(s) - protonation , infrared multiphoton dissociation , benzene , dissociation (chemistry) , chemistry , photochemistry , infrared , ion , gas phase , photodissociation , infrared spectroscopy , analytical chemistry (journal) , organic chemistry , physics , optics
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 C 6 H 7 + ions (obtained by the gas‐phase protonation of benzene) by the absorption of free electron laser radiation shows a wavelength‐dependent dissociation of H 2 (see spectrum) that matches the transitions calculated for the σ complex benzenium ion.