Author(s):      CHOWDHURY SK; CAMERON SD; COX DM; KNIAZ K; STRONGIN RA; CICHY
                   MA; FISCHER JE; SMITH AB

Title:          MASS-SPECTROMETRIC INVESTIGATION OF POLYFLUORINATED C(60)--
                   EVIDENCE FOR THE EXISTENCE OF C(60)F(2N)(N = 0-30)

 Source:         ORGANIC MASS SPECTROMETRY V0028 N8 AUG 1993 pp. 860-866.
 Abstract:       Electron-capture negative ion chemical ionization (EC-NICI)
                 and field desorption (FD) mass spectrometric techniques were
                 utilized to examine polyfluorinated C60. Two different
                 samples from the same preparation, one prior to sublimation
                 and the other sublimed material, were investigated. From the
                 raw non-sublimed product in EC-NCI six series of ions
                 corresponding to different numbers of attached oxygen atoms
                 were obtained, which are represented by the formula <
                 C60F2nOm>-, where n ranged from 0 to 30 and m from 0 to 5.
                 The sublimed material in EC-NICI produced the same six series
                 of ions with up to 48 fluorine atoms attached to C60. The
                 field desorption of the same sample produced similar
                 results, but the signal-to-noise ratios of the spectra were
                 low. Both samples, in the two different techniques examined,
                 yielded C60F60 ions with only an even number of fluorine
                 atoms attached. The present investigation, for the first
                 time, provides direct experimental evidence for the
                 existence of higher fluorinated C60 up to C60F60 and
                 multiple oxides of polyfluoro-C60 with up to five oxygen
                 atoms attached.