Spectrophotometric Studies on Organometallic Complexes Used in Analytical Chemistry. VIII : Composition and Formation Constant of Uranyl-Flavonol Complex
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The composition and the formation constant of uranyl-flavonol complex were studied spectrophotometrically by means of McConnell's method. From the results, it was clear that two species of the complex exist, the composition of which can be represented as UO_2Fl+ and UO_2Fl_2. The first and second formation constants of uranyl-flavonol complex, k_1 and k_2, were observed to be 2.2_0×10^<10> and 9.1_7×10^<8> respectively, and therefore, the overall formation constant can be represented as 2.0×10^<19>. The dissociation constant of flavonol was observed spectrophotometrically to be 5.6_2×10^<-11>. The uranyl-flavonol complex can be extracted in TBP as UO_2Fl_2. nTBP.
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