THE UV DIFFERENCE SPECTRA AS A CHARACTERISTIC FEATURE OF PHENOLS AND AROMATIC-AMINES

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