Formation of Mixed Ligand Complexes of Some Tripositive Rare Earth Ions

Abstract

Quantitative complex equilibrium reactions of La³⁺, Ce³⁺, Pr³⁺, Nd³⁺, Sm³⁺, and Eu³⁺ with o-aminophenol (HA) (and catechol (H₂B) involving the formation of binary complexes MA²⁺, MA₂²⁺, MA₃, MB⁺, MB₂^–, MB₃³⁺, (where M = La³⁺, Ce³⁺, Pr³⁺, Nd³⁺, Sm³⁺, and Eu³⁺) and the ternary complexes MAB, MA₂B^–, MB₂A^2- due to simultaneous coordination of A^– and B^2- with the metal in, have been studied at 25 ºC and an ionic strength of 0.10 M KNO₃. The corresponding equilibrium constants calculated by the methods reported earlier by Nayan and Dey, have been discussed.