水溶性アゾ染料イオンの水-有機溶媒混合媒体中における光吸収変化とエタノールの吸光光度定量への応用

DOI 機関リポジトリ NDLデジタルコレクション Web Site Web Site 被引用文献1件

書誌事項

タイトル別名
  • Color change behavior of water soluble azo-dye ions in a water-organic solvent mixed medium and its application to a spectrophotometric method for the determination of ethanol.
  • 水溶性アゾ染料イオンの水‐有機溶媒混合媒体中における光吸収変化とエタノールの吸光光度定量への応用
  • スイヨウセイ アゾ センリョウ イオン ノ ミズ ユウキ ヨウバイ コンゴウ

この論文をさがす

抄録

Solvent effects on the absorption spectra of water soluble azo-dye ions were investigated. Three types of azo-dyes (Type I, II and III) were used: Type I consists of 4-(4-dialkylaminophenylazo)benzene sulfonate ions (alkyl: methyl, ethyl, propyl and butyl groups), Type II, of 1-alkyl-4-(4-diethylaminophenylazo) pyridinium ions (alkyl: methyl, ethyl and propyl groups) and Type III, of N, N, N-trimethyl-p-phenylazoanilinium ion and its nitro derivative. Of these three types, the Type I dyes showed the most remarkable change in absorption spectrum. The absorption maximum wavelength decreased with increasing alcohol content: the more hydrophilic the dye ion and the alcohol, the greater was the blue shift of the absorption spectrum. This remarkable blue shift is attributed to a change in the contributions of the following resonance forms:<BR>R2+N_??_=N-N-_??_-SO3-(A)_??_R2N-_??_-N=N-_??_-SO3-(B)<BR>With an increasing alcohol concentration or hydrophobicity around the dye ion, the contribution of the cationic form (A) decreases. By measuring the change in Propyl Orange absorbance at 420 nm, ethanol can be determined. The absorptiometric method of ethanol determination with Propyl Orange was applied to the flow injection procedure.

収録刊行物

  • 分析化学

    分析化学 39 (4), 201-205, 1990

    公益社団法人 日本分析化学会

被引用文献 (1)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ