有機化合物のポーラログラフ的研究 : (第7報) 2, 6-dichlorophenolindophenolの特異波に就て

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In strongly alkaline medium 2, 6-dichlorophenolindophenol gives anomalous three waves on the polarogram and the current intensity of the limiting diffusion current (wave-heigth) changes with the time of standing. Their reduction potentials were -0.345 V, -0.555 V, and -0.948 V (vs. N.C. E.) respectively. From the polarograms obtained at pH 14, the first and the second waves are considered most probably as the waves due to the inclusion of semiquinone and the last wave must be due to the reduction of the decomposition product. The structure of semiquinone seems to be as follows ; and it is anionic sensiquinons that is stable. According to the Michaelis theory the semiquinone form-ation constant is about 20 in a buffered solution of pH 12.2. But we are of opinion that the semiquinone is formed not only by the electrolytic reduction but by the inner reaction of the solution itself upon standing._??_
社団法人日本農芸化学会の論文