Complexation equilibria in tetrahydrofuran solutions of palladium(II) and lithium bromides

Resumo

The solutions of palladium PdBr₂ and lithium LiBr bromides in tetrahydrofuran (THF) at different concentrations were studied by UV–Vis spectroscopy. The data obtained were mathematically processed using various models. The best description was obtained with the model that includes the formation of four monomeric (PdBr⁺, PdBr₂, PdBr₃^-, PdBr₄^2-) and three dimeric (Pd₂Br₂²⁺, Pd₂Br₄, Pd₂Br₆^2-) palladium complexes. The equilibrium constants of the monomer and dimer complexation stages and the extinction coefficients of the palladium complexes were calculated. The spectra of the individual monomer and dimer palladium complexes were calculated using this model.