Electrochemical and ESR characterization of C{sub 84} and its anions in aprotic solvents
Journal Article
·
· Journal of Physical Chemistry
- Univ. of Houston, TX (United States)
- SRI International, Menlo Park, CA (United States)
Cyclic voltametry and differential pulse voltametry studies on the D{sub 2} and D{sub 2d} isomers of C{sub 84} ae reported in pyridine, benzonitrile, acetonitrile/toluene (15/85), dimethylformamide/toluene (15/85), and 1,2-dichlorobenzene. The nature of the solvent is found to greatly affect the number and half-wave potentials of the observed redox processes. For example, 10 reduction processes are observed in pyridine, while seven are detected in benzonitrile. The multiple redox processes in pyridine are taken as evidence for the presence of two isomeric forms of C{sub 84} in solutions, namely, the D{sub 2} and D{sub 2d} isomers, each of which has distinct half-wave reduction potentials. A comparison between the electrochemistry of C{sub 60}, C{sub 70}, C{sub 76}, C{sub 78}, C{sub 84}, and C{sub 86} is presented. ESR studies were performed on solutions containing one or a mixture of the C{sub 84} anion(s) and confirmed the presence of two isomers, D{sub 2}- and D{sub 2d}-C{sub 84}. Emphasis in this paper is placed on D{sub 2d}-C{sub 84}{sup 2-}; its ESR spectra at different temperatures are discussed and interpreted in terms of a thermally accessible triplet excited state and rotation of the dianion. 18 refs., 10 figs., 3 tabs.
- OSTI ID:
- 249662
- Journal Information:
- Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 18 Vol. 100; ISSN JPCHAX; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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