G. Khairallah et Jb. Peel, CYANO ADDUCT ANIONS OF C-70 - ELECTROSPRAY MASS-SPECTROMETRIC STUDIES, The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory, 101(36), 1997, pp. 6770-6774
Negative-ion electrospray mass spectrometry of C-70/CN- solutions was
used to study the cyano adduct anions of [70]fullerene, revealing both
monoanionic and dianionic species. The most abundant anions are C-70(
CN)(n)(-), n = 1, 2, 3, and C-70(CN)(n)(2-), n = 2, 4, 6, with C-70(CN
)(-) as the dominant anion at low concentrations. The observation of C
-70(CN)(2)(.-), the only odd-electron species identified, is at varian
ce with the behavior of C-60 where only even-electron anions were obse
rved under similar experimental conditions. Semiempirical calculations
suggest that CN addition is generally favored in the unique ''equator
ial'' region of C-70 and that in the dianion species this region is ab
le to support two negative charges in relative proximity, in contrast
to the results obtained for C-60 dianion adducts.