Abstract
Measurements of the difference absorption spectra were made for 12 phenols and 11 aromatic amines. Aqueous solutions of the same concentration and pH values 8–13 and 1–2 were measured against each other. The difference spectra were found to have a similar run within the group of compounds: monohydroxyl phenols, naphthols, quinolines, aniline and its derivatives and pyridine and its derivatives. The spectra reflect the changes in the conjugated bond systems caused by shifts in acid-base equilibria of the compounds examined.
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