Effect of pH on the formation of poly Fe (III)-S-Amino 1,10 phenanthroline

摘要

In this work, the results related to the electrochemical behavior of the Fe (III)-5-Amino 1,10 phenanthroline system (Fe(III)-5-Aphen) are presented. The electropolymerization process of this chemical species was studied onto a carbon paste electrode (CPE), as a function of pH's values inside the 0.3 - 6.2 interval. The cyclic voltammetry technique was used to form and determine the incorporation of the Fe (III) ion into the polymer matrix. It was observed that Fe(III) was incorporated into de polymer matrix in the 2.5 < pH > 6.0 interval. At pH < 2.5, only the characteristic electrochemical signals of the 5-Aphen ligand were observed. These results are in good agreement with the spectrophotometric study of the Fe (III)-5-Aphen complex in aqueous solution. In these experiments, it was found that the metal complex is stable at pH > 2.5 and poly Fe (III)-5-Aphen films are obtained.