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The symmetric diamide derivatives of iso- and terephthalic acids and J acid are described. The spectrophthotometric properties of the dyes in solution and on cotton fabric, their aggregation, pK a , azo-hydrazone tautomerism and photostability were determined. It was found that amide derivatives of iso- and terephthalic acids influence in a different way at physico-chemical and application...
The enthalpy of formation for the azo and hydrazone tautomers (A & H Ts) of 1-phenylazo-2-naphthols, 2- and 4-phenylazo-1-naphthols and 4-phenylazo-1-naphthol-2-sulfonic acids was estimated both in the gaseous phase and in water using a semi-empirical molecular orbital PM5 and COSMO method. Substituent effects on the solvation energies for these phenylazonaphthols were analysed in detail. The...
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