1961 年 81 巻 7 号 p. 1020-1026
Coloration of the oximes and/or semicarbazones of 2-acyl-4-alkylpyridines (acyl=acetyl, propionyl, butyryl, and valeryl; alkyl=methyl and ethyl) with metal ions (iron (II), iron (III), copper (II), nickel (III), and cobalt (II)) was examined. These metals form a complex salt in the solution and gives colorations as listed in Table I. Composition of these complex salts in solution was determined by the continuous variation method (Figs. 1 and 2) and absorption spectra of these complex salts were also measured (Figs. 3-18).