Fluorescent benzo[de]anthracen-7-one pH-sensor in aqueous solution and immobilized on viscose fabrics

The photophysical characteristics of a new water-soluble fluorescent pH sensitive 1-[(7-Oxo-7H-benzo[de]anthracen-3-ylcarbamoyl)-methyl]-pyridinium chloride based on ICT (internal charge transfer) are described. “On-off” switching of fluorescence as a function of pH in aqueous solution of the above substance has been observed. For the first time the viscose textile fabric has been investigated as a solid matrix for immobilizing the sensor molecules. The fluorescent behaviour of dyed viscose fabric in pH 2.0–12.1 range is discussed.