Ionization constants and spectral properties of some chromone azo dyes

Some new chromone containing azo dyes were prepared. The ionization constants of the chromone and its azo dyes were determined potentiometrically and spectrophotometrically. The effects of substituent, medium, and temperature on the ionization of these compounds were discussed. The effect of solvent polarity on electronic absorption spectra was discussed also. The IR spectra of the compounds have been investigated and discussed in relation to molecular structure