Electroreduction of buckminsterfullerene, C{sub 60}, in aprotic solvents: Electron spin resonance characterization of singly, doubly, and triply reduced C{sub 60} in frozen solutions

Journal Article · Wed Jul 29 04:00:00 EDT 1992 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja00042a023· OSTI ID:457072

Dubois, D; Jones, M T; Kadish, K M ^[1]

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1. Univ. of Houston, TX (United States)

The results of ESR studies on frozen solutions of buckminsterfullerene anion radicals, C{sub 60}{sup n{minus}}(n = 1, 2, and 3), in the solvents benzonitrile, dichloromethane, pyridine, and tetrahydrofuran are reported and discussed. The samples are prepared by electrochemical reduction techniques which allow the preparation of samples which contain, quantitatively and selectively, the desired anionic species. The ESR spectral features of the anions in frozen solutions were studied as a function of temperature. The ESR line shapes and linewidths are dependent upon the solvent and the temperatures whereas the g values are independent of solvent and only weakly dependent upon temperature. The C{sub 60}{sup {minus}}(S = 1/2)g value averages 1.998 over the four investigated solvents and the temperature range of 77-210 K. The resonances of C{sub 60}{sup 2 {minus}} are centered at about g = 2.00 and indicate a triplet ground state with an average separation of 12.6 {Angstrom} between the two unpaired electrons. The C{sub 60}{sup 3{minus}} resonance has a g value of 2.001-2.002 which is closer to that of the free electron as compared to C{sub 60}{sup {minus}} and C{sub 60}{sup 2{minus}}. It also exhibits features similar to the monoanion, suggesting a spin of 1/2. 25 refs., 7 figs., 3 tabs.

• Sponsoring Organization: USDOE
• OSTI ID: 457072
• Journal Information: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 16 Vol. 114; ISSN JACSAT; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
ATOMIC CLUSTERS
ELECTROCHEMISTRY
ELECTRON SPIN RESONANCE
ELECTRONIC STRUCTURE
FULLERENES
G VALUE
RADICALS
REDUCTION