Abstract
The azo reagent 3-((benzothiazol-2-diazenylnaphthalene-2,7-diol] was synthesized and characterized by FT-IR ,1H-NMRand 13CNMR spectral techniques. The electrochemical behavior of the azo reagent and its complex with Cu (II) has beenstudied at glassy carbon disk GCE electrode in different supporting electrolyte at concentration (1M) and scan rate(100mv.s-1). Spectrophotometric determination of copper (II ) is based on the formation of a 2:1 complex with abovereagent. The complex has λmax at(588) nm and Ômax of( 1.436x104)L.mol-1.cm-1 .A linear correlation (0.1 – 3.0 μg. ml-1) was found between absorbance at λmax and concentration . The effect of diverseions on the determination of copper (II) to investigate the selectivity of the method were also studied . The stabilityconstant of the product was (1.1x108 ) . The proposed method was successfully applied to the analysis of honey sample .
Highlights
Azo compounds have been the most extensively used class of dyes owing to their versatile application in several fields, such as advanced application in organic synthesis, dyeing cloth fiber biomedical studies, azo dyes are used in coloring agents in Pharmaceuticals and foods
The determination of metal ion at trace amount have been shown important in the fields of biological and environment studies literature date indication that azo compound have been broadly used in the spectrophtometric determination of metal ions [6-13]
In this study, we wish to report the electrochemical behavior of this reagent and as a selective reagent in spectrophotometric determination of micro amounts of copper (II).be suggested as the following: Structure of (BTHN) is a tridentate via azo group, hydroxyl group and nitrogen atom of thaizol group : it has the following structure: HO
Summary
Absorption Spectra: The reagent (BTHN) )nm possess a maximum absorption at 440 nm (Fig .1) reacts with ( CuCl2.2H2O) at room temperature to give a (BTHN-Cu(II) colored complex at pH 7. ISSN 2321-807X Volume 12 Number Journal of Advances in Chemistry Different supporting electrolyte was be used with the reagent(BTHN) at GCE with scan rate (0.1Vs-1) for all cyclic voltammogrames .All voltammogrames are shows reduction peak of azo group (-N=N-) at potential ranged (-500mv –750mv). For reagent(BTHN) was proposed that the best supporting electrolyte is (KCl) (Fig. 11,12),current was highest between other electrolytes , cyclic voltammogram shows irreversible electrochemical system in which the electron transfer rates are significantly less than the rate of mass transport and the reduction in two steps , the first reduction attributed to azo group giving a hydrazo derivative , second reduction peak to breaks N-N linkage to form two primary amine molecules Table(6) Current –Potential data of(BTHN) in several supporting electrolyte Solution (1M) with scan rate (0.1Vs-1)
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