The relationship of graphite/AsF5 intercalation compounds to Cx+AsF6? salts |
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Authors: | Fujio Okino Neil Bartlett |
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Institution: | Department of Chemistry and Materials and Molecular Research Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720 U.S.A. |
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Abstract: | Graphite intercalated by AsF5 has been reported to give compounds of formula C8nAsF5 where n is the stage. It is doubtful however if materials of exact composition C8nAsF5 have ever been obtained. The intercalation of graphite by AsF5 is associated with electron oxidation of the graphite according to the equation: 3AsF5 + 2e? → 2AsF6? + AsF3. Because of the easy removal or displacement of AsF3 the As:F ratio is readily increased beyond 5. By treating graphite with excess AsF5, removing volatiles under vacuum and repeating the cycle seven times a first stage salt C10+AsF6? (Co = 7.96 ā) is made. Interaction of graphite with AsFs in the molar ratio 8:1, within a small volume reactor, yields a material of approximate composition C8AsF5. The major component of the volatiles at the onset of their removal is AsF5,, but, at a composition close to C10AsF5, is AsF3. ‘Graphite AsF5’ can be prepared by adding AsF3 to CxAsF6 salts. The electrical conductivities of ‘AsF5’ and AsF6 relatives will be compared and discussed. |
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