Polarographic studies on ninhydrin in DMF and dehydration from gem-diol structure.
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概要
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The d.c.-polarogram of ninhydrin (I) in DMF containing 0.1 M TEAP shows three cathodic waves whose <I>E</I><SUB>1⁄2</SUB> are −0.38, −0.65, and −1.23 V (<I>vs.</I> SCE), respectively. The first wave with a large maximum is attributed to one-electron reduction of 1,2,3-indantrione (II), the hydrated form of I, the second to one-electron reduction of I, and the third to one-electron reduction of the preceding electrochemical product from both I and II. CV Curves of I show three cathodic peaks, pc<SUB>1</SUB>, pc<SUB>2</SUB>, and pc<SUB>3</SUB>, and two anodic peaks, pa<SUB>1</SUB> and pa<SUB>2</SUB>, showing reversible character of pc<SUB>1</SUB> and pc<SUB>3</SUB> but not of pc<SUB>2</SUB>. Different equilibria seem to take place between I and II in the bulk of the solution and at electrode surface. Hydration of II and dehydration of I in DMF were observed at 550 nm spectroscopically. A scheme is proposed for the electrolytic reduction of I in DMF.
- 公益社団法人 日本化学会の論文
著者
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OHMORI Mitsuaki
Osaka City Institute of Public Health and Environmental Sciences
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Takagi Masanosuke
Laboratory Of Biophysical Chemistry College Of Agriculture
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