Small-angle X-ray scattering and mass spectrometry studies of {gamma}-irradiated C{sub 60} in cyclohexane
- Oak Ridge National Lab., TN (United States)
- Case Western Univ., Cleveland, OH (United States)
Intense (1.42 krad/min) {gamma}-radiolysis of C{sub 60} dissolved in cyclohexane (weak magenta-colored solution) to a total dose of 51 krad resulted in the formation of a new compound (muddy red in color) with a solubility of more than 30 times that of saturated C{sub 60} in toluene. Low-power, laser desorption Fourier transform mass spectrometry (LD-FTMS) of the product yielded two ions at m/z=1539 and 1556, which correspond to [C{sub 60}(cyclohexane){sub 10}-xH]{sup +} for x=23 and 6, respectively. Higher power laser desorption conditions as well as collision-induced dissociation experiments of selected ions show the sequential loss of cyclohexane (C{sub 6}H{sub 10}) units. Small-angle X-ray scattering (SAXS) of the dissolved material supports the mass spectrometry results of cyclohexane additions to the sphere. Taken together, the mass spectrometry and SAXS data indicate that the identity of the {gamma}-radiolysis products of C{sub 60} in cyclohexane most likely are cyclohexyl adducts of C{sub 60}, primarily C{sub 60}(cyclohexane){sub 10}. The SAXS data further indicate that some of the C{sub 60}(C{sub 6}H{sub 12}){sub x} entities aggregate into dimers in solution. A model is proposed in which cyclohexyl and hydrogen atom radiolysis products attach to C{sub 60} across double bonds. These double bonds are possibly those associated with the two top and bottom 5-fold symmetry positions around two opposing pentagons. 25 refs., 7 figs., 2 tabs.
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 226689
- Journal Information:
- Journal of Physical Chemistry, Vol. 100, Issue 13; Other Information: PBD: 28 Mar 1996
- Country of Publication:
- United States
- Language:
- English
Similar Records
THE RADIATION CHEMISTRY OF CYCLOHEXANE. A Detailed Progress Report Covering Period January 1959 to April 1960
Characterization of radiation-induced products of thymidine 3{prime}-monophosphate and thymidylyl (3{prime}{yields}5{prime}) thymidine by high-performance liquid chromatography and laser-desorption fourier-transform mass spectrometry