Spectroscopic studies of the arylidene derivatives of some aminobenzoic acids hydrazides

The electronic absorption spectra of the arylidene derivatives of m- and p-aminobenzoic hydrazides were investigated in organic solvents of varying polarities and buffer solutions of different pH values. The behavior in buffer solutions was utilized for the determination of the acid dissociation constant. The important bands in the IR-spectra of compounds as well as the main signals in the 1H-NMR spectra were assigned and discussed in relation to molecular structure