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Isomer-Selective Generation and Spectroscopic Characterization of Picolyl Radicals |
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| Authors: | Engelbert Reusch Dr Fabian Holzmeier Philipp Constantinidis Dr Patrick Hemberger Prof Dr Ingo Fischer |
| Institution: | 1. Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
These authors contributed equally to this work.;2. Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany Present address: Institut des Sciences Moléculaires d'Orsay ISMO (UMR 8214 CNRS), Bâtiment 350, Université Paris-Saclay, 91405 Orsay Cedex, France These authors contributed equally to this work.;3. Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany;4. Laboratory for Femtochemistry and Synchrotron Radiation, Paul Scherrer Institut (PSI), 5232 Villigen, Switzerland |
| Abstract: | Nitrogen-containing resonance-stabilized radicals such as the picolyl radical are important in combustion chemistry and astrochemistry. They have only been scarcely studied because an isomer-selective generation is often difficult. Herein, we present threshold photoelectron spectra of the three picolyl radical isomers, C6H6N, that were obtained with synchrotron radiation. The radicals were selectively generated by flash pyrolysis from aminomethylpyridine precursors through deamination. Ionization energies of 7.70, 7.59, and 8.01 eV were determined for 2-, 3-, and 4-picolyl, respectively. The observed vibrational structure was assigned to an in-plane deformation mode of the aromatic ring. The spectroscopic insight gained in this study can be used to distinguish different picolyl isomers in on-line combustion analysis, for example. |
| Keywords: | high-temperature chemistry ionization potentials photoelectron spectroscopy radicals synchrotron radiation |