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Isomer‐Selective Generation and Spectroscopic Characterization of Picolyl Radicals
Author(s) -
Reusch Engelbert,
Holzmeier Fabian,
Constantinidis Philipp,
Hemberger Patrick,
Fischer Ingo
Publication year - 2017
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.201703433
Subject(s) - radical , chemistry , photochemistry , propyne , combustion , flash vacuum pyrolysis , pyrolysis , organic chemistry
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, C 6 H 6 N, 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.