Triphenyl methane dyes as sensor materials for solvent detection with surface-acoustic-wave devices


  • Dedicated to Professor Hans-Jürgen Bestmann on the occasion of his 65th birthday

  • Financial Support by "Fonds der Chemischen Industrie" is gratefully acknowledged.


Highly-colored phthalide carbenium ions (see figure) embedded in a matrix of phenols can form the basis of solventsensing devices able to detect a variety of solvents in concentrations down to a few ppm. Solvent absorption disturbs hydrogen bonding producing a less favorable environment for the cations, the changing concentration of which can be monitored using optical absorption, or SAW-devices.

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