@article{PreitschopfSturmStroganovaetal.2023,
  author    = {Preitschopf, Tobias and Sturm, Floriane and Stroganova, Iuliia and Lemmens, Alexander K. and Rijs, Anouk M. and Fischer, Ingo},
  title     = {IR/UV Double Resonance Study of the 2-Phenylallyl Radical and its Pyrolysis Products},
  series = {Chemistry - A European Journal},
  volume    = {29},
  journal   = {Chemistry - A European Journal},
  number    = {13},
  doi       = {10.1002/chem.202202943},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-312338},
  year      = {2023},
  abstract  = {Isolated 2-phenylallyl radicals (2-PA), generated by pyrolysis from a nitrite precursor, have been investigated by IR/UV ion dip spectroscopy using free electron laser radiation. 2-PA is a resonance-stabilized radical that is considered to be involved in the formation of polycyclic aromatic hydrocarbons (PAH) in combustion, but also in interstellar space. The radical is identified based on its gas-phase IR spectrum. Furthermore, a number of bimolecular reaction products are identified, showing that the self-reaction as well as reactions with unimolecular decomposition products of 2-PA form several PAH efficiently. Possible mechanisms are discussed and the chemistry of 2-PA is compared with the one of the related 2-methylallyl and phenylpropargyl radicals.},
  language  = {en}
}
@phdthesis{Preitschopf2023,
  author    = {Preitschopf, Tobias},
  title     = {Disentangling the Formation of PAHs in Extreme Environments by IR/UV Double Resonance Spectroscopy},
  doi       = {10.25972/OPUS-32279},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-322791},
  school      = {Universit{\"a}t W{\"u}rzburg},
  year      = {2023},
  abstract  = {Polycyclic Aromatic Hydrocarbons (PAHs) are considered as key building blocks in the formation of carbonaceous particles such as soot. In our immediate surroundings, they are mainly generated in incomplete combustion processes and are further considered as carriers of the Unidentified Infrared Bands which are detected in a wide variety of astrophysical envelopes in the interstellar medium. Currently, astrochemical as well as combustion related models favour small resonance stabilized radicals (RSR) as major contributors to PAHs in sequential reactions. Therefore, we generated two RSR under well-defined conditions to investigate their contribution to PAH formation in a pyrolysis microreactor. The various reaction products were identified by IR/UV ion dip spectroscopy which combines the mass-selectivity of UV light with the structural sensitivity of IR radiation. Finally, we investigated the intermolecular interactions in azaphenanthrene dimers in combination with high-level theoretical calculations and found a preferential formation of pi-stacked van der Waals cluster in a molecular jet expansion.},
  subject      = {Infrarotspektroskopie},
  language  = {en}
}
@article{MukhopadhyaySchleierWirsingetal.2020,
  author    = {Mukhopadhyay, Deb Pratim and Schleier, Domenik and Wirsing, Sara and Ramler, Jaqueline and Kaiser, Dustin and Reusch, Engelbert and Hemberger, Patrick and Preitschopf, Tobias and Krummenacher, Ivo and Engels, Bernd and Fischer, Ingo and Lichtenberg, Crispin},
  title     = {Methylbismuth: an organometallic bismuthinidene biradical},
  series = {Chemical Science},
  volume    = {11},
  journal   = {Chemical Science},
  number    = {29},
  doi       = {10.1039/D0SC02410D},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-251657},
  pages     = {7562-7568},
  year      = {2020},
  abstract  = {We report the generation, spectroscopic characterization, and computational analysis of the first free (non-stabilized) organometallic bismuthinidene, BiMe. The title compound was generated in situ from BiMe\(_3\) by controlled homolytic Bi-C bond cleavage in the gas phase. Its electronic structure was characterized by a combination of photoion mass-selected threshold photoelectron spectroscopy and DFT as well as multi-reference computations. A triplet ground state was identified and an ionization energy (IE) of 7.88 eV was experimentally determined. Methyl abstraction from BiMe\(_3\) to give [BiMe(_2\)]• is a key step in the generation of BiMe. We reaveal a bond dissociation energy of 210 ± 7 kJ mol\(^{-1}\), which is substantially higher than the previously accepted value. Nevertheless, the homolytic cleavage of Me-BiMe\(_2\) bonds could be achieved at moderate temperatures (60-120 °C) in the condensed phase, suggesting that [BiMe\(_2\)]• and BiMe are accessible as reactive intermediates under these conditions.},
  subject      = {Photoelektronenspektroskopie},
  language  = {en}
}