Study of Uranium(VI) Complexation with Dithiolphenols and Hydrophobic Amines

Resumo

The interaction of uranium(VI) with editionpanorama (2,6-dithiolphenol, 2,6-dithiol-4-methylphenol, 2,6-dithiol-4-ethylphenol, 2,6-dithiol-4-tert-butylphenol) and hydrophobic amines has been studied by absorption spectroscopy. Hydrophobic amines used are aniline, N–methylaniline, N,N-dimethylaniline, diphenylguanidine, triphenylguanidine, benzylamine, phenantrolin, dipyridyl, p-aninopyridin, 2‑(N,N-dimethylaminomethyl)-4-methylphenol, and 2-(N,N-dimethylaminomethyl)-4-bromphenol. The optimal conditions for the formation and extraction of ionic associates are found and the ratios of components in the complexes are determined. It has been found that associates are formed in a weakly acidic medium (pH_opt 3.5–7.1). The maxima in the light absorption spectra are observed at λ = 434–478 nm. Molar coefficient of absorption is equal to ε = (2.65–3.62) × 10⁴. On the basis of the obtained data, photometric methods of uranium determination in various objects have been developed.