Mutual determination of Iron and Tropolone

概要

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It has been known that tropolone reacts with iron to give green and brownish red complexes. It was found that the green complex is formed in the presence of excess iron, while the latter, in the presence of excess tropolone. The green complex shows a broad absorption band with its maxima at 435 and 582 mμ. The maximal color develops over the acidity range from 0.05 to 1 N. The formation of the brownish red one is complete over the pH range from about 1.3 to 8.5 and it shows the absorption peaks at 425, 550 and 595 mμ. The composition of the green complex is 1 : 1. That of red one is considered to be 1 : 3. The formation constant of the green complex is evaluated to be 1.0×10^<11>. These complexes are utilized in the mutual determination of iron and tropolone. Beer's law is valid for both complexes at the wavelength of maximum absorbancy and iron and tropolone have been determined up to 0.07 γ/ml and 1.0×10^<-5> M/1 respectively.
東北大学の論文