ハイドロオキシフルオランおよびその誘導体の有機試薬としての利用研究(第8報) : 3′, 4′, 5′, 6′-Tetrahydroxyfluoran誘導体の合成とBi, Sbの定量

抄録

3', 4', 5, ' 6'-Tetrahydroxyfluoran derivatives, substituted with 3, 4, 5, 6-tetrachloro and carboxyl, and their esters were synthesized and their possible use as organic reagents was examined. These derivatives, unlike the non-substituted compounds, did not show any fluorescence and had greater solubility in organic solvents. Added to these advantages, they showed sensitive coloraton with Bi³⁺, Sb³⁺, Th⁴⁺, Sn⁴⁺, and Pb²⁺ions. Of these derivatives, the methyl ester of 3, 4, 5, 6-tetrachloro-3', 4', 5', 6'-tetrahydroxyfluoran was especially suited for chelate titration of bismuth, and the coloration tone was much more bright than that using 3', 4', 5', 6'-tetrahydroxyfluoran. This compound can also be used for absorption spectral determination of bismuth and antimony, it being possible to determine bismuth at 620mμ in a range of 0-10 μg/ml, and antimony at 590mμ in a range of 0.4-3.0μg/ml.