ペンタシアノ鉄錯塩による芳香族第一級アミン及び若干の有機硫黄化合体の呈色反応について
1952 年 72 巻 9 号 p. 1101-1106
詳細
1952 年 72 巻 9 号 p. 1101-1106
The pentacyano-iron complex salts, such as sodium nitroprusside, sodium pentacyano-amminferroate and sodium pentacyanoaquoferroate, react with aromatic primary amines and some R-NH-CS-NH-R′ type compounds, such as aromatic thiosemicarbazones, thiocarbanilides, and p-ethoxyphenylthioureas, in caustic soda solutions, in the presence of hydrogen peroxide, to give green coloration. The procedure is as follows: To a very small amount of the sample are added 5 drops of 2.5% solution of sodium nitroprusside, 1% solution of sodium pentacyanoamminferroate or 1% solution of sodium pentacyanoaquoferroate, 2 drops of 35% hydrogen peroxide, and 3 drops of 1N sodium hydroxide, and the mixture is heated in a boiling water bath.
Green coloration is also developed by reacting sodium nitroprusside and sodium azide, in the phosphoric acidity, to aromatic primary amines and R-NH-CS-NH-R′ type compounds, and rendering the mixture alkaline with sodium hydroxide. This method can also be used to estimate qualitatively the aromatic primary amines and some compounds of R-NH-CS-NH-R′ type.
