Fluorinated tropylium ions in the mass spectra of some polyfluoroaromatic compounds

✍ Scribed by M. I. Bruce; Mair A. Thomas

• Publisher: John Wiley and Sons
• Year: 1968
• Tongue: English
• Weight: 360 KB
• Volume: 1
• Category: Article
• ISSN: 1076-5174
• DOI: 10.1002/oms.1210010310

✦ Synopsis

The most prominent ion in the mass spectra of C,F,CH,X (X = H, Br, CH:CH,, COCI, and CH,C6F5) is C,F5H2+, formulated as the pentafluorotropylium cation. This ion is also found, in an amount comparable to the parent ion, in the spectrum of (CBF5)*CH2. The heptafluorotropylium cation is found similarly in the spectrum of C,F,CF,. The mass spectra of (C&)&HBr and [(C,F,),CH], exhibit an ion Cl3F1,H+ as the base peak, which is probably a pentafluorophenylpentafluorotropylium cation.

The alcohol (C6F5)2CHOH shows loss of CBFS, followed by 2H, as a major breakdown pathway. The mode of formation, and the subsequent fragmentation, of the major ions in these spectra, are discussed.