2,2'-ジヒドロキシアゾベンゼンによるアルミニウムの抽出/蛍光定量における陰イオンの影響

概要

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2, 2'-Dihydroxazobenzene (DHAB) and 4, 4'-dimethyl derivative (DDAB) react with aluminium (III) in an aqueous solution to form fluorescent 1 : 1 (metal-DHAB or DDAB) complexes. We studied the effects of anions and neutral ligands on the extraction/fluorometric determination of aluminium by using these complexes. The aluminium-DHAB complex was extracted with tributyl phosphate (TBP), and with benzene by adding trioctylphosphine oxide (TOPO). A large amount of appropriate anions i. e. acetate, propionate, thiocyanate and perchlorate, was required for the extraction of the complex. Especially the addition of propionate and thiocyanate gave a strong fluorescence. TBP and TOPO acted as neutral adductants and remarkably increased both the extractability and fluorescence quantum yield of the complex. TOPO also acted as a catalyst for the reaction between aluminium and DDAB. The ratio of the composition of the extracted complexes Al- (DHAB or DDAB) - (anion) - (TBP or TOPO) was 1 : 1 : 1 : 2 in the presence of acetate, and 1 : 1 : 1 : 3 in the presence of perchlorate.
社団法人日本分析化学会の論文
1989-09-05