Non-aqueous capillary electrophoresis of p-quinone anion radicals.
The electrophoretic detection of two kinds of p-quinone anion radicals arising from the electrolysis of benzoquinone and chloranil was achieved by employing an acetonitrile medium. Sufficient dehydration of a running solution was necessary for the detection of the benzoquinone anion radical. Oxygen in the running solution also caused a serious decrease in the amount of the benzoquinone anion radical during electrophoresis. The addition of methanol as a hydrogen-donor decreased the electrophoretic mobility of the benzoquinone anion radical significantly, while that of the chloranil anion radical was little changed. This result is interpreted in terms of hydrogen-bonding interaction between the p-quinone anion radicals and methanol, reflecting the magnitude of their proton-accepting ability (benzoquinone anion radical > chloranil anion radical).
Esaka
Y
Y
Gifu Pharmaceutical University, Mitahora-higashi, Japan.
Okumura
N
N
Uno
B
B
Goto
M
M
D000838:Anions / Q000737:chemistry; D016227:Benzoquinones / Q000737:chemistry*; D004572:Electrolysis; D019075:Electrophoresis, Capillary; D005609:Free Radicals / Q000737:chemistry; D006860:Hydrogen Bonding; D007202:Indicators and Reagents; D000432:Methanol / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry; D014867:Water / Q000737:chemistry
D000838:Anions; D016227:Benzoquinones; D005609:Free Radicals; D007202:Indicators and Reagents; D014867:Water; C004532:quinone; D010100:Oxygen; D000432:Methanol