Mihaljević, Branka; Ražem, Dušan
Monothiocyanatoiron(III) complex in dichloromethane-methanol solvent mixture.
Croatica Chemica Acta, 76
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.
||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
||NATURAL SCIENCES > Chemistry
||Division of Materials Chemistry
|Project title||Project leader||Project code||Project type|
|Fizičko-kemijski učinci ionizirajućih zračenja||Dušan Ražem||0098063||MZOS|
||15 Nov 2013 12:54
||27 Feb 2014 14:12
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