Study of stability physical chemical of 3-[2′-thiazolylazo]-2,6-diaminopyridine and the formation of 3-[N,N-ethyl-met-azo]-2,6-diaminopyridine as new ligand chromophore

The 3-[2'-thiazolylazo]-2,6-diaminopyridine or 2,6-TADAP have been used as chromophore reagent for the determination of metals of the platinum group. In this work a study of the stability of the 2,6-TADAP is included, a synergetic action of the temperature, the reaction time and the acidity of the medium was found. According to spectral behavior it can be postulated that 2,6-TADAP ligand suffers structural changes, having as consequence the formation of another azocompound. Besides, the mechanism of decomposition and characterization of the formed compound was also included. The characteristic chemical of new azocompound is appropriate for the development of analytic methods for the determination of metals belonging to the platinum group, using the new ligand called 3-[N,N-ethyl-met-azo]-2,6-diaminopyridine or 2,6-DAPEMA.