キンヒドロン 化学特性,用途語,生産方法
外観
暗緑色, 結晶～結晶性粉末
溶解性
熱水, エタノール及びアセトンに溶けやすく, 冷水にわずかに溶ける。
解説
キンヒドロン,青緑色の光沢をもつ赤褐色の結晶．融点171 ℃．エタノール，エーテルに易溶，水に不溶．溶液中では大部分両成分に解離している．キンヒドロン電極として水素イオン指数の測定に利用される．
森北出版「化学辞典（第2版）
用途
キンヒドロン電極用。
製法
キノンを還元，またはヒドロキノンを酸化する際に途中で生成するが，キノンとヒドロキノンのアルコール溶液を混合すればキンヒドロンが析出するキンヒドロン．
化学的特性
a dark green crystalline powder which is a complex formed by benzoquinone and hydroquinone.
Quinhydrone is a general reagent used in potentiometric titrations. It can also be used as a π-acceptor in the formation of charge-transfer complex of analytes for spectrophotometric analysis.
使用
In pH determinations (quinhydrone electrode).
定義
The so-called quinhydrone electrode, containing equivalent amounts of p-benzoquinone and hydroquinone, is used to determine hydrogen ion concentrations of unknown solutions. Hydroquinone is used principally as a photographic developing agent. The main advantages of the quinhydrone electrode are low internal resistance, rapid response, high accuracy, simplicity, free of errors due to the presence of nonreducing gases, and free of salt errors. Major limitations are that it contaminates the solution, cannot be used to monitor a flowing solution, the solution must be free of strong oxidizing and reducing agents, and it is limited to a pH range of 1 to 9. In alkaline solution, the weakly acidic H2Q is neutralized and is subject to oxidation by air and dissolved oxygen. The main application of the quinhydrone electrode is in nonaqueous solvents where reproducible results are obtained in a variety of solvents. The tetra-chloro derivative (chloranil electrode) is even more useful.
一般的な説明
Quinhydrone/methanol treatment for the measurement of carrier lifetime in crystalline silicon substrates has been reported. Surface passivation of silicon substrates by quinhydrone/ethanol treatment has been investigated.
危険性
Toxic by ingestion.
純化方法
Crystallise quinhydrone from H2O at 65o , then dry it in vacuo.[Beilstein 7 H 617, 7 IV 2069.]
キンヒドロン 上流と下流の製品情報
原材料
準備製品