Monothiocyanatoiron(III) complex in dichloromethane-methanol solvent mixture

Mihaljević, Branka; Ražem, Dušan (2003) Monothiocyanatoiron(III) complex in dichloromethane-methanol solvent mixture. Croatica Chemica Acta, 76 (3). pp. 249-254. ISSN 0011-1643

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Abstract

Complexation of Fe-III ion with thiocyanate in dichloromethane-methanol solvent mixture was studied because of our interest in the analytical uses of Fe-II-to-Fe-III transformations in non-aqueous media. Molar absorptivity and composition of the complex, as well as the solvolysis constant and the stability constant of the complex as a function of the solution composition were determined by spectrophotometry. The composition of the complex throughout the solubility range of the components was that of a monocomplex, [FeNCS](2+). In highly acidic solutions, molar absorptivity of the complex was not influenced by acid concentration and was (13 700 +/- 700) dm(3) mol(-1) cm(-1). The solvolysis constant was similar to the value in water, K-s = 7.0 x 10(-3) mol dm(-3). The stability constant of the complex, on the other hand, was strongly influenced by acid concentration. Extrapolation to the infinite acid concentration yielded the stability constant 40 500 dm(3) mol(-1), which is adequate for analytical uses of the complex in non-aqueous media.

Item Type:	Article
Uncontrolled Keywords:	iron(III); thiocyanate; thiocyanatoiron(III) complex; stability constant; spectrophotometry; non-aqueous medium; ferric thiocyanate assay; lipid hydroperoxides; iron(iii); kinetics; ion; mechanism; pressure; exchange; chloride; constant
Subjects:	NATURAL SCIENCES > Chemistry
Divisions:	Division of Materials Chemistry
Projects:	Project title Project leader Project code Project type Fizičko-kemijski učinci ionizirajućih zračenja Dušan Ražem 0098063 MZOS
Depositing User:	Branka Mihaljević
Date Deposited:	15 Nov 2013 12:54
URI:	http://fulir.irb.hr/id/eprint/954

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