Photoionisation of the tropyl radical

Please always quote using this URN: urn:nbn:de:bvb:20-opus-128652
  • We present a study on the photoionisation of the cycloheptatrienyl (tropyl) radical, \(C_7H_7\), using tunable vacuum ultraviolet synchrotron radiation. Tropyl is generated by flash pyrolysis from bitropyl. Ions and electrons are detected in coincidence, permitting us to record mass-selected photoelectron spectra. The threshold photoelectron spectrum of tropyl, corresponding to the \(X^{+1}A1’ ← X^2E_2”\) transition, reveals an ionisation energy of 6.23 ± 0.02 eV, in good agreement with Rydberg extrapolations, but slightly lower than theWe present a study on the photoionisation of the cycloheptatrienyl (tropyl) radical, \(C_7H_7\), using tunable vacuum ultraviolet synchrotron radiation. Tropyl is generated by flash pyrolysis from bitropyl. Ions and electrons are detected in coincidence, permitting us to record mass-selected photoelectron spectra. The threshold photoelectron spectrum of tropyl, corresponding to the \(X^{+1}A1’ ← X^2E_2”\) transition, reveals an ionisation energy of 6.23 ± 0.02 eV, in good agreement with Rydberg extrapolations, but slightly lower than the value derived from earlier photoelectron spectra. Several vibrations can be resolved and are reassigned to the C–C stretch mode \(ν_{16}^+\) and to a combination of \(ν_{16}^+\) with the ring breathing mode \(ν_2^+\). Above 10.55 eV dissociative photoionisation of tropyl is observed, leading to the formation of \(C_5H_5^+\) and \(C_2H_2\).show moreshow less

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Metadaten
Author: Kathrin H. Fischer, Patrick Hemberger, Andras Bodi, Ingo Fischer
URN:urn:nbn:de:bvb:20-opus-128652
Document Type:Journal article
Faculties:Fakultät für Chemie und Pharmazie / Institut für Physikalische und Theoretische Chemie
Language:English
Parent Title (English):Beilstein Journal of Organic Chemistry
Year of Completion:2013
Volume:9
Pagenumber:681-688
Source:Beilstein Journal of Organic Chemistry 2013, 9, 681–688. doi:10.3762/bjoc.9.77
DOI:https://doi.org/10.3762/bjoc.9.77
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 54 Chemie / 547 Organische Chemie
Tag:dissociative photoionisation; gas phase; reactive intermediates; synchrotron radiation; threshold photoelectron spectroscopy
Release Date:2016/03/31
Licence (German):License LogoCC BY: Creative-Commons-Lizenz: Namensnennung