Physico-chemical study of mixed-ligand selenium(IV) complexes: ternary complex of selenium(IV) with alizarin maroon and eosin

Abstract

The reaction of selenium(IV) with alizarin maroon (AZM) as a primary ligand and eosin as a secondary ligand was examined spectrophotometrically and potentiometrically at 20 ± 0.1 °C and an ionic strength of 0.1 M(perchloric acid). The solution spectra of the mixed-ligand complex formed is characterised by an absorption band with λ_max. at 560 nm within the pH range 6.5–7.2. The pink selenium-(AZM)₂-(eosin)₂ association complex conformed to Beer's law over the concentration range 0.16–2.0 µg ml^–1 of selenium with a molar absorptivity of 2.5 × 10⁴ l mol^–1 cm^–1.