Unimolecular Metastable Decomposition of Bis(2,2,2-trifluoroethyl)Ether, CF_3CH_2OCH_2CF_3, and Ethyl 2,2,2-Trifluoroethyl Ether., CH_3CH_2OCH_2CF_3, upon Electron Ionization

概要

論文の詳細を見る
The unimolecular metastable decompositions of bis(2,2,2-trifluoroethyl) ether, CF3CH2OCH2CF3 (1), and ethyl 2,2,2-trifluoroethyl ether, CH3CH2OCH2CF3 (2), induced by electron ionization, have been investigated by mass-analyzed ion kinetic energy (MIKE) spectrometry and energy-dependent collision-induced dissociation (CID) spectra in conjunction with thermochemical data. In the metastable time window, the molecular ions of 1 decompose into the ions at m/z 113 by the loss of CF3 and m/z 83 by the consecutive losses of CF3 and CH2O, while those of 2+ • decompose into the ions at m/z 113 and m/z 59 by the elimination of CH3 and CF3 , respectively. The decomposition of the latter fragment ion is similar to that of the m/z 59 ion from the corresponding fluorine-free analogue, diethyl ether, CH3CH2OCH2CH3 (3), that is, fragment ions m/z 41 and m/z 31 are observed, which correspond to the competitive losses of H2O and C2H4, respectively. The metastable ions m/z 113 from 1+ • and 2+ • decompose in a variety of ways: in addition to the fragment ion m/z 65, which is generated by the elimination of CHFO, four other fragment ions with m/z 83, 63, 61, and 31 are observed , which correspond to the competitive losses of CH2O, (CH2O+HF), CH2F2, and C2HF3 (or C2H4F2O), respectively.
日本質量分析学会の論文
2002-08-01