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Ionic Properties of Hydrogenated and Fluorinated Fullerenes

Published online by Cambridge University Press:  22 February 2011

R.L. Hettich ,
C. Jin ,
P.F. Britt ,
A.A. Tuinman  and
R.N. Compton
R.L. Hettich
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831-6125
C. Jin
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831-6125
P.F. Britt
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831-6125
A.A. Tuinman
Affiliation:
Department of Chemistry, The University of Tennessee, Knoxville, TN 37996-1600
R.N. Compton
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831-6125 Department of Chemistry, The University of Tennessee, Knoxville, TN 37996-1600
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Abstract

The ionization potentials (IP) and electron affinities (EA) for a number of hydrogenated and fluorinated derivatives of C60 and C70 have been determined using the charge exchange “bracketing” technique. Samples of C60Hx and C70Hy were prepared by direct solid phase hydrogenation (x=2-18, y=2-30) or platinum oxide catalytic hydrogen reduction (x=36, y=36). The IP's for C60H2-18 are between 6.75 and 7.53 eV for even x<10 and lower than 6.75 for odd x<10. The EAs for C60F44,46,48, and C70F52,54 were “bracketed” to be 4.0 ± 0.25 eV. The highly fluorinated chiral C3h molecule C60F48 was observed to directly attach two electrons in the gas phase to produce C60F482- and C60F462− + F2−. Studies of the metastable decompositions and collision-induced dissociation of C60F482− showed fluorine atom and F2 loss, but no loss of an electron. In addition, the C60F48,46,442− dianions do not charge exchange with molecules possessing high electron affinities, including the neutral parent compound, C60F482− (EA = 4.06 eV). The remarkable stability of C60F482− to the removal of an excess electron is attributed to a long-range Coulomb barrier which is built from the bound state for the two electrons near the molecule and the electron-electron Coulomb repulsion between the two at large distance.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 349: Symposium T – Novel Forms of Carbon II , 1994 , 133
Copyright
Copyright © Materials Research Society 1994

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References

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