Studies on the Synthesis of Bromodimethylaminoaniline-fluorone and Its Colour Reaction with Iron

Abstract

Abstract: Ahighly sensitive colour reagent bromodimethylaminoaniline-fluorone (BDMAF) was synthesized and identified. The colour reaction of BDMAFwith iron in the presence of auxiliary complexing ligands and surfactants was studied systematically. The blue quaternary complex of Fe-acetylacetone-BDMAF-CTMABexhibits absorption maximum at 608 nm with an apparent molar absorptivity of 1 .6 × 10⁵ L.mol^-1 .cm^-1 in the medium of NH₃-NH₄C1 buffer of pH 9.5～10.5. Its apparent stability constant is 6.8×10¹². Beer's law is obeyed for iron of 0～5.5 mg/25 L. The composition of this complex was found to be Fe( Ⅲ):BDMAF = 1:2. The method has a high selectivity in the presence of 'EGTA, it has been applied to the determination of trace amounts of Fe³⁺ in zinc alloys without separation. The variation coefficients are 3.2%～3.9% for the four standard samples of zinc alloys measured (7 times).

Key words: Bromodimethylaminoaniline-fluorone, Iron, Acetylacetone, Cetyltri- methylammonium bromide

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Yang Bailing, Yu Ximao, Yu Xiaomei. Studies on the Synthesis of Bromodimethylaminoaniline-fluorone and Its Colour Reaction with Iron[J]. Chem. J. Chinese Universities, 1989, 10(6): 581.

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Studies on the Synthesis of Bromodimethylaminoaniline-fluorone and Its Colour Reaction with Iron

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