Electrochemical Study of the Complexation of Methyl Yellow with Some Metal Ions as a Model for Doped Poly Azo Compound

Abstract

The electrochemical behaviour of the complexation of 4-dimethylaminoazobenzene (methyl yellow) with some metal ions has been evaluated using square wave voltammetry. The interactions between the azo compound with metal ions Co²⁺, Cd²⁺, Rb⁺, Rh³⁺, Ti³⁺, Hg²⁺, La³⁺ and Sc³⁺ were measured in phosphate buffer solution at pH 7. The slope obtained from the relationship between diffusion current (I_p) and concentration of azo compound is most steep for Sc³⁺ while Rb⁺ has the least steep slope. This indicates that amongst the metal ions investigated, Sc³⁺ has the most interaction with the azo compound.