Resorcinolの置換に関する研究 (第8報)

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Absorption spectra were measured of 12 kinds of compounds, including 4-phenylazoresorcinol, 4-(o-tolyl) azoresorcinol, 4-nitrobenzeneazoresorcinol, and the mono-and dimethyl ethers in acid, neutral, and alkaline solvents. Absorption of 4-nitrobenzeneazoresorcinol series compounds were observed only in the visible region, but the compounds of other two systems were observed up to the ultraviolet range, and the absorption maxima of the B- and K-bands were determined. The absorption maxima of these compounds were found to vary greatly according to the reaction of the solvent, shift to the longer wave length region being most marked in alkaline side. The displacement of the absorption maxima in compounds with free hydroxyl and its methylated derivatives were compared in acid and neutral medium to examine its relationship with chelation. The absorption maxima in acid solvent was found to have shifted by 10-15mμ (at 370-380mμ) due to chelation while this point remained obscure in a neutral medium. Discussions are also made on the structure of 4-nitrobenzeneazoresorcinol.