Spectrophotometric Study of Iron(III)-Lactic Acid Complexes, and Suggested Mechanism for the Photoredox Reaction of the Complex

The spectral characteristics of the iron(III) lactate complexes were examined by the spectrophotometric methode, and the absorbance of these complexes has been studied at diferente wavelengthes . The stoichiometry of the photoreactive complex formedin the iron(III)-lactate system has been investigated in aqeuous solution under determinative experimental conditions. Initial concentrations whether of Iron(III) or of lactic acid ranged from to , and -values were belonging to the range . The results showed, that the ratio of iron(III) to lactate in the photoreactive complex is 1:2, i.e. its formula is . This complex has a maximum absorption at 365 nm. Its molecular absorption coefficient is about ≈ and its dissociation constant is about . The tentative mechanism for the photochemical decomposition of the complex has been suggested, in agreement with the reference studys . The suggested mechanism depends on the relationship between the absorbance and the photoreaction kinetics, and it is not based on the qualitative or quantitative analysis of reaction products.