Studies of azo compounds III UV-VIS, IR and 1H-NMR spectroscopic study of monoazodyes based on salicyl-aldehyde

The electronic absorption spectra of some monoazodyes based on salicylaldehyde are studied in organic solvents of different polarities. The spectra are discussed in terms of medium effects and molecular structure. Band assignment is also attempted. The variation of absorbance with pH is utilized for the determination of pKa The important bands in the ir-spectra as well as the main signals of the [1]Hnmr spectra are also discussed in relation to molecular structure