Design of acidochromic dyes for facile preparation of pH sensor layers

摘要: Eight new acidochromic dyes have been synthesised that can be used for optically monitoring pH in the range from 3 to 12. Their corresponding pK a values both measured and calculated theoretically by means of density functional theory. The synthesis these is facile without need chromatographic purification. covalently linked polymers containing hydroxyl functions such as cellulose, polyurethane hydrogel, hydroxyalkyl methacrylate. resulting sensor layers exhibit significant colour changes UV visible spectral range.