An experimental insight into the reaction intermediate of methane activation by metal-free radical cations (SO2+) was studied. The [CH4-SO2+].+ intermediate was obtained instead by SO2/CH4 high pressure chemical ionization performed in a high sensitivity double focusing mass spectrometer. he low yield requires both high sensitivity and high resolution, since isobaric peaks are found at the same nominal weight of m/z 80. The [CH4-SO2+].+ ion was mass selected and submitted to structural assay by CAD mass spectrometry. The high resolution CAD spectrum shows that the ionic population does not contain a [SO 2+-CH4].+ ion-molecule complex. Fragments such as m/z 31 (C,H3,O)+ and 63 (C,H 3,S,O)+ indicate that the ion explores strongly bound structures along the energy surface and raise the question of whether the methyl group is bound to the oxygen or sulfur atom.
Methane Activation by Metal-Free Radical Cations: Experimental Insight into the Reaction Intermediate / DE PETRIS, Giulia; Troiani, Anna; Marzio, Rosi; Giancarlo, Angelini; Ornella, Ursini. - In: CHEMISTRY-A EUROPEAN JOURNAL. - ISSN 0947-6539. - STAMPA. - 15:17(2009), pp. 4248-4252. [10.1002/chem.200802581]
Methane Activation by Metal-Free Radical Cations: Experimental Insight into the Reaction Intermediate
DE PETRIS, GIULIA;TROIANI, Anna;
2009
Abstract
An experimental insight into the reaction intermediate of methane activation by metal-free radical cations (SO2+) was studied. The [CH4-SO2+].+ intermediate was obtained instead by SO2/CH4 high pressure chemical ionization performed in a high sensitivity double focusing mass spectrometer. he low yield requires both high sensitivity and high resolution, since isobaric peaks are found at the same nominal weight of m/z 80. The [CH4-SO2+].+ ion was mass selected and submitted to structural assay by CAD mass spectrometry. The high resolution CAD spectrum shows that the ionic population does not contain a [SO 2+-CH4].+ ion-molecule complex. Fragments such as m/z 31 (C,H3,O)+ and 63 (C,H 3,S,O)+ indicate that the ion explores strongly bound structures along the energy surface and raise the question of whether the methyl group is bound to the oxygen or sulfur atom.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.