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 Co 2+, Cd 2+, Rb+, Rh 3+, Ti 3+, Hg 2+, La 3+ and Sc 3+ were measured in phosphate buffer solution at pH 7. The slope obtained from the relationship between diffusion current (Ip) and concentration of azo compound is most steep for Sc 3+ while Rb+ has the least steep slope. This indicates that amongst the metal ions investigated, Sc 3+ has the most interaction with the azo compound