Abstract
A new organic reagent (e)-2-hydroxy-3-((2-hydroxybenzylidene)(amino)benzenesulphonic acid was synthe-sized on the basis of salicylic aldehyde. The dissociation constant of the reagent was determined using a pH-metric method in a water-ethanol medium: pK1 = 8.47 ± 0.03, pK2= 9.38 ± 0.04. The complexation of Fe(III) with (e)-2-hydroxy-3-((2-hydroxybenzylidene)(amino)benzenesulphonic acid was studied in the presence of diantipyrylphenylmethane (DAPM) and 8-hydroxyquinoline. Optimal conditions for the complexation were established. The main spectrophotometric characteristics of the complexes, such as pHopt, λopt, molar absorption coefficient, the compositions of the complexes and the interval where Beer's law holds, were calculated. The study of iron (III) complexation with the reagent showed that diverse-ligand complex-es are formed in the presence of DAPM and 8-hydroxyquinoline. During this reaction, bathochromic shifts are observed in the absorption spectrum, with the maximum yield shifting to the acidic medium compared to single-ligand complexes. The effect of individual ions and masking agents on the formation of binary and diverse-ligand iron (III) complexes was investigated, showing that the selectivity of the reaction increases in the presence of diantipyrylphenylmethane and 8-hydroxyquinoline. The developed technique was used to determine the microquantities of iron in bread and wheat bran.
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