Liquid-Liquid Extraction-Chromogenic Systems Containing Iron(III), 4-Nitrocatechol and Tetrazolium Salts
نویسندگان
چکیده
Complex formation and liquid-liquid extraction were studied in systems containing iron(III), 4-nitrocatechol (4NC),tetrazolium salt (TZS), water and organic solvent. Three different TZS were used: 3-(4,5-dimethyl-2-thiazol)-2,5-diphenyl-2H-tetrazolium bromide (MTT), 3-(2-naphtyl)-2,5diphenyl-2H-tetrazolium chloride (Tetrazolium violet, TV) and 2-(4-iodophenyl)-3-(4-nitrophenyl)5-phenyl-2H-tetrazolium chloride (INT).The cations of the first two TZSs (TZ+: MTT+ and TV+) form intensively colored (molar absorptivity of 4.6×104 L mol–1 cm–1 and 4.4×104 L mol–1 cm–1, respectively) chloroform extractable ion-associates with the FeIII-4NC anionic chelate. These ternary complexes can be represented with the following general formula: (TZ)3[Fe (4NC)3] 3-.
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