Abstract
Visible absorption spectra and compositions of copper(II)-bromide and nickel(II)-thiocyanate complexes sorbed in anion-exchange resin phases have been investigated. The spectral patterns in the resin are considerably different from those in the solution, giving a shift in maximum for both complexes and a new shoulder at the shorter wavelength side of the absorption peak for the nickel-thiocyanate complex. The compositions of the complexes sorbed in the anion-exchange resin from various solutions have been determined by a new method involving three-phase distribution analysis with cation-exchange resin, anion-exchange resin and external solution. The results indicated that the composition varies from a neutral complex CuBr2 to a complex CuBr42− for the copper-bromide complex system and from a cationic complex NiNCS+ to a saturated complex Ni(NCS)64− for the nickel-thiocyanate complex system, respectively, with increase in the ligand concentration.
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