トリウムのエリオクロムシアニンR錯体と第4級アンモニウム塩の相互作用

概要

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The interaction of thorium-Eriochrome Cyanine R (ECR) complex with quaternary ammonium salts has been studied. Cetyltrimethyl ammonium chloride, dodecyltrimethyl ammonium bromide, decyltrimethyl ammonium bromide, and octyltrimethyl ammonium bromide were used as the quaternary ammonium salts. A shift of absorption maximum to a longer wavelength and an increase in the absorbance of thorium-ECR complex were observed by addition of each quaternary ammonium salt. But absorption spectra of thorium-ECR complex in aqueous solutions of the quaternary ammonium salts were varied considerably with difference of carbon number of alkyl group of the quaternary ammonium salts. Under the optimum concentration of the quaternary ammonium salts, the molar absortivity at the absorption maximum of thorium-ECR complex were 1.07 × 105 at 584 nm for cetyltrimethyl ammonium bromide, 1.13 × 105 at 599 nm for dodecyltrimethyl ammonium bromide, 1.0 × 105 at 600 nm for decyltrimethyl ammonium bromide, 1.59 × 105 at 604 nm for octyltrimethyl ammonium bromide and 4.0 × 104 at 530 nm for no addition. The composition of thorium-ECR complex measured by the continuous variation method was estimated to be thorium: ECR=1:2 in each case. Absorption spectrum of the thorium-ECR complex was not so changed by addition of heptyltrimethyl ammonium bromide.
社団法人日本分析化学会の論文