Abstract
The UV-Vis properties in neutral and acid media of some N, N-dialkylaminoazobenzenes containing electron donor substituents in the unsubstituted benzene ring are discussed. A redistribution of the individual vibronic band intensities within the long wavelength absorption π-π ∗ band due to specific solvation of the molecules in neutral media is observed and the corresponding vibrational sub-bands are assigned. In acid media, the increased positive halochromism is explained within the charge transfer (CT) models of the corresponding chromogenic systems. The tautomeric equilibrium constants, K t and p K a values of the ammonium and azonium tautomeric forms are evaluated.
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