Abstract
Formation of complex salts in 0.5N sodium hydroxide solution was examined spectrometrically in about 10 kinds of azophenol series compounds. Of these dyes, o, o′-dihydroxyazobenzene and o-hydroxyphenylazoresorcinol form complex salts with copper, cobalt, and nickel but not with zinc, cadmium, or manganese. The concentration of the dye and inorganic ions was 1/6×10-4M. Some of the dyes underwent decomposition in alkaline solution and Cu2+ was found to accelerate such decomposition.
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