RELATION BETWEEN MOLECULAR STRUCTURE AND SPECTRAL CHARACTERISTICS OF SOME CHELATING MONO-AZO DYES BASED ON o-HYDROXY ARYL ALDEHYDES AND CARBOXYLIC ACIDS

Article abstract of DOI:10.1016/0584-8539(89)80267-3

The electronic spectra of some chelating mono-azo compounds have been studied in some organic solvents of varying polarities.The u.v. bands in ethanol and cyclohexane are assigned in the light of electronic transitions.The effect of microscopic and macroscopic solvent polarity parameters are also discussed.The i.r. spectra of the solid compounds as KBr discs as well as the 1H NMR spectra have also been assigned and discussed in relation to molecular structure.The azo ->/<- hydrazone tautomerism in some of these compounds is assured.The study indicated that the colour of the materials depends on the polarity and the formation of intermolecular H-bonds with the solvent molecules.