Abstract

Galya K. Toncheva, Teodora S. Stefanova and Kiril B. Gavazov*

DOI : http://dx.doi.org/10.13005/ojc/310137

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)-2,5-diphenyl-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 Fe^III-4NC anionic chelate. These ternary complexes can be represented with the following general formula: (TZ⁺)₃[Fe^III(4NC)₃]³⁻.

iron(III); 4-nitrobenzene-1;2-diol; ion-association; ternary complex; solvent extraction

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