2-(2-ピリジルアゾ)-5-メチルフェノールの合成と金属イオンとの反応

概要

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2-(2-Pyridylazo)-5-methylphenol (PAP-5-Me) was synthesized, and its acid dissociation constants and the color reaction with metal ions were determined spectrophotometrically. PAP-5-Me is prepared from 2-hydrazinopyridine and 4-methyl-1,2-benzoquinone with a yield of (60〜67) %. The product, red-colored needle-like crystalline solid melting at (100〜101)℃, is soluble in organic solvents such as alcohols and chloroform and also to a slight extent in water. The acid dissociation constants of the reagent are pK_<a1>=2.55±0.02 and pK_<a2>=8.75±0.02 at 25℃ and μ=0.1. PAP-5-Me forms water-insoluble chelates with a large variety of metal ions. These chelates are made water-soluble by nonionic surfactant, Triton X-100. The color reaction of the reagent with metal ions shows that it will be applicable for the spectrophotometric reagent of metal ions.
社団法人日本分析化学会の論文
1980-06-05