Polarography of Halides in Dimethylformamide. V. Bromine and the Tribromide Ion
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概要
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The polarographic behavior of bromine and the tribromide ion at the dropping mercury electrode was investigated in dimethylformamide. A freshly-prepared solution of bromine gives two cathodic waves. When the solution is allowed to stand at 25°C in the dark, however, the first wave gradually becomes anodic, independently of the electrolysis. When the first wave is completely anodic, an equilibrium is established. The resulting polarogram coincides with that of hydrogen tribromide. The formation of hydrogen tribromide was ascribed to the chemical reduction of bromine by dimethylformamide. Diffuse sunlight accelerates the decomposition of bromine, which in turn yields hydrogen bromide. It was also suggested that, when the dropping mercury is used as an indicator electrode, bromine and the tribromide ion may react with the dropping mercury prior to being electrolyzed, forming mercuric bromide and the tribromomercurate ion respectively, which may in turn depolarize the indicator electrode.
- 公益社団法人 日本化学会の論文
著者
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Date Yoshio
Department of Agricultural Chemistry, Faculty of Agriculture, Shimane University
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Matsui Yoshihisa
Department of Agricultural Chemistry, Faculty of Agriculture, Shimane University
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