Fiber-optic potassium ion sensor based on a novel color-changing crown ether dye

Kyota Miyazaki, Koji Tohda, Hiroyuki Ohzora, Kazuhiko Watanabe, Hidenari Inoue, Koji Suzuki

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


A novel color-changing anionic crown ether dye, 4'-[2″,4″-di-(2,4-dinitro-6-trifluoromethylphenylamino)-6″-trifluoromethylphenyl]aminobenzo-15-crown-5 (chromogenic aminobenzo-15-crown-5, CAB15C5), was synthesized and applied to a new photochemical material K+ sensor. The photochemical K+-sensor probe was prepared using the CAB15C5-based poly (vinyl chloride) matrix-membrane set 1 mm apart from the tip of a bifurcated optical fiber with a cylindrical plastic support. This sensor could detect a wide range of K+ concentration (10-6~10-1 M) at pH 10 by measuring the absorbance change at 520 nm with approximately 1000 times selectivity against Na+. The theory of the photochemical K+-sensor was discussed on the basis of the cation extraction mechanism using the color-changing crown ether dye (GAB15C5).

Original languageEnglish
Pages (from-to)717-722
Number of pages6
Issue number11
Publication statusPublished - 1990
Externally publishedYes


  • crown ether dye
  • fiber-optic potassium ion sensor
  • photochemical ion sensor probe

ASJC Scopus subject areas

  • Analytical Chemistry


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