Atmospheric pressure photoionization mechanisms.2. The case of benzene and toluene (Articolo in rivista)

Type
Label
  • Atmospheric pressure photoionization mechanisms.2. The case of benzene and toluene (Articolo in rivista) (literal)
Anno
  • 2003-01-01T00:00:00+01:00 (literal)
Alternative label
  • Tubaro M., Marotta E., Seraglia R., Traldi P. (2003)
    Atmospheric pressure photoionization mechanisms.2. The case of benzene and toluene
    in RCM. Rapid communications in mass spectrometry
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Tubaro M., Marotta E., Seraglia R., Traldi P. (literal)
Pagina inizio
  • 2423 (literal)
Pagina fine
  • 2429 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 17 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
  • Viene descritto il comportamento di benzene e toluene sotto irraggiamento UV in una sorgente ionica a pressione atmosferica (APPI). Si osserva la formazione di fenolo ed altri sistemi aromatici. Tali reazioni possono essere rilevanti sia da un punto di vista analitico (per la messa a punto di metodi APPI), sia dal punto di vista chimico ed ambientale. (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR-ISTM (literal)
Titolo
  • Atmospheric pressure photoionization mechanisms.2. The case of benzene and toluene (literal)
Abstract
  • Benzene and toluene have been proposed previously as dopants in atmospheric pressure photoionization (APPI) experiments on compounds exhibiting ionization energies higher of the energy of photons used for irradiation. Their low ionization energies lead to their easy photoionization and the ions so formed lead to the ionization of analytes through charge-exchange. However, some measurements have shown that some protonation reactions also take place, and a series of experiments was undertaken to investigate this unexpected behaviour. It was shown that, when benzene is irradiated in the APPI source, the odd-electron molecular ions of phenol, diphenyl ether and phenoxypheno are produced in high yield, together with protonated diphenyl ether and protonated phenoxyphenol. These results have been confirmed by deuterium labelling and MS/MS experiments. A possible mechanism is proposed, based on a radical attack by benzene molecular ions on oxygen molecules present inside the APPI source, analogous to that proposed in the literature for phenyl radicals. Similar results have been obtained with toluene, proving that APPI is able to activate a series of reactions leading to highly reactive species which are highly effective in promoting ionization of molecules with ionization energies higher than the photon energy. (literal)
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