金属置換反応による水溶液中における金属-ポルフィリン錯体生成の促進

抄録

A study on the metal-substitution reaction of metalloporphyrin complexes has been done I. f rom the viewpoint of acceleration of the complex formation of porphyrins with metal ions in aqueous solution. Cadmium (II), mercury (II) and lead (II) complexes of anionic porphyrins such as α, β, γ, δ-tetrakis (4-sulfophenyl) porphine andα, β, γ, δtetrakis (4-carboxyphenyl) porphine were found to be metal-substituted almost instantaneously by copper(II), zinc(II), cobalt (II)or manganese(II) even at room temperature in aqueous alkaline solution. However, the metal-substitution of their complexes of cationic porphyrins such as α, β, γ, δ-tetrakis (1-methylpyridinium3-yl)porphine and α, β, γ, δ-tetrakis(1-methylpyridiniurn-4-yl)porphine by the metal ions above was not so fast as expected. On the basis of this finding, a possible rapid spectrophotometric determination of copper, zinc, cobalt and manganese at ppb levels with the anionic porphyrins as color-producing reagents was suggested.