In-situ electrochemical ESR the oxidation of triphenylacetic acid in acetonitrile
The oxidation of triphenylacetic acid in acetonitrile on platinum electrodes at + 1.94 V (vs. SCE) results in the formation of triphenylmethylcarbonium ions. If the potential is subsequently stepped to values negative of the Φ3C+/Φ3C· standard electrode potential (+0.25 V vs. SCE), reduction to the...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
1986
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| Summary: | The oxidation of triphenylacetic acid in acetonitrile on platinum electrodes at + 1.94 V (vs. SCE) results in the formation of triphenylmethylcarbonium ions. If the potential is subsequently stepped to values negative of the Φ3C+/Φ3C· standard electrode potential (+0.25 V vs. SCE), reduction to the triphenylmethyl radical is seen. In rigorously anhydrous conditions no radicals other than Φ3C. can be detected by ESR. However in moist acetonitrile, oxidation at +1.94 V followed by reduction at -1.80 V results in complicated spectrum shown to be due to two radicals, namely the radical anions of benzoquinone and benzophenone. A mechanism to account for the formation of these is suggested. |
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