Jp. Deng et al., ELECTROSPRAY AND LASER-DESORPTION IONIZATION STUDIES OF C60O AND ISOMERS OF C60O2, Journal of physical chemistry, 99(41), 1995, pp. 14907-14910
The reaction of C-60 With ozone in toluene results in the formation of
C-60 oxides. C60O and two isomers of C60O2 were isolated; they both h
ave the 423 nm absorption peak characteristic of an epoxide structure
between adjacent 6,6-rings in C-60. Intact molecular ions are generate
d by electrospray ionization (ESI) without fragmentation. The enhanced
ESI sensitivity of the higher oxides reflects the increase in electro
n affinity upon oxidation. In contrast to ESI, odd-numbered fragments
are observed in laser desorption ionization (LDI) of C60O. The two iso
mers of C60O2 show different intensity distributions of the same fragm
ent ions in LDI, suggesting different distances between the two oxygen
atoms in them. Mechanisms are proposed for the formation of the two i
someric forms of C60O2 and for mass spectrometric fragmentation proces
ses.