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Two lipophilic derivatives of Reichardt’s phenolbetaine were dissolved in thin layers of plasticized poly(ethylene vinyl acetate) copolymer. These layers were coated with microporous white PTFE in order to allow reflectance (transflectance) measurements to be performed. The sensor layers respond to aqueous ethanol with a colour change from green to blue when increasing the ethanol content. The highest...
We report on a chromogenic ligand which reversibly interacts with alcohols resulting in a change in both absorbance and fluorescence. When embedded in membranes composed of plasticized PVC, p-N,N-dioctylamino-4 -trifluoroacetylstilbene (ETH T 4004) shows a significant signal change on exposure to aqueous ethanol with a decrease in absorbance at 453 nm and an increase in absorbance at 373...
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