The compounds and their derivatives containing the azo component N=N are increasingly used in various fields of life and practice. They are used as indicators, dyes, optical sensors and recording devices in holographic environments, in photodynamic therapy, in molecular motors and in other photonic devices, and some of their metal complexes as drugs. Unfortunately, the literature has no enough information for azo-azomethine derivatives application for the determination of metal ions in samples with different matrix compositions. The mention above gives us the reason for developing a sensitive and selective method for the determination of heavy metals in aqueous samples.
Therefore, the present abstract describes the development of a voltammetric method for the determination of Cu (II) ions in surface water samples using novel N-phthalimide azo-azomethine compounds as ligands. The assays were performed in a three-electrode cell with a voltammeter (Metrohm 797 VA, with 797 VA stand) on a HMDE-working electrode against Ag / AgCl, KCl (3.00 mol l-1) as a reference electrode. The results showed that the proposed method allows selective determination of Cu (II) with detection limits: 0.230 ng ml-1 and determination: 0.423 ng ml-1. The method is sensitive with a coefficient of analytical function: 5x106 μA.ml mol-1. The precision of the determinations estimated by the relative standard deviation is Sr = 0.8%.