COMPLEXATION OF Ge (IV) WITH 6,7-DIHYDROXYBENZOPYRYLLIUM DERIVATIVES AND THEIR ANALYTICAL APPLICATION
DOI:
https://doi.org/10.15421/jchemtech.v31i3.287489Keywords:
6,7-dihydroxybenzopyrylium salts, germanium (IV), complexation, spectrophotometry, optical emission spectroscopy with inductively coupled plasmaAbstract
In the current study, the formation of germanium (IV) complexes with some alkyl and phenyl derivatives of 6,7-dihydroxybenzopyrylium was studied. The stoichiometry of Ge(IV) : R = 1 : 2 complexes was established by classical spectrophotometric methods such as the molar ratio method and the equilibrium shift method. On the basis of the data set, the mechanism of complex formation is proposed. It is shown that the complexing agent is the cation Ge(OH)22+, and the ligand interacts in the form of an anhydride base. The chemical-analytical characteristics of the complexes were determined, and it was noted that the most intensely colored and stable are Ge (IV) complexes with 6,7-dihydroxy-2,4-diphenylbenzopyrylium and 6,7-dihydroxy-4-methyl-2-phenylbenzopyrylium salts. It is shown that the introduction of phenyl substituents in positions 2 and 4 of the benzopyrylium fragment leads to a shift of complex formation to a more acidic region, an increase in complex stability, and an increase in their molar absorptivity. Using 6,7-dihydroxy-2,4-dimethylbenzopyrylium salts, a technique for determining germanium (IV) after its extraction and separation in the form of tetrachloride was developed. The method was tested in the analysis of standard reference materials of sludge, coke and dietary supplement samples.
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