Electrogenerated Chemiluminescence And Applications Of Several Kinds Of Transition Metal Complexes

Transition metal complexes had been widely used in electrogenerated chemiluminescence analytical technique due to its unique photophysical and chemical properties in recent years. So far, ECL properties of many transition metal complexes were reported, such as Ru, Os, Cr, Cd, Pt, Al, Mo, Re, Ir, Eu, Cu and so on. Among these complexes, Ru, Ir, Re complexes show good ECL properties. As a classical luminescence reagent, Ru(bpy)32+system’s luminescent mechanism and application had been widely studied. On this basis, three kinds of transition metal complexes’ ECL characteristics were mainly studied in this work.The main content of this work is divided into the following three parts:In chapter 1, the basic concept of the electrogenerated chemiluminescence, the basic reaction type, and the reaction mechanism were introduced, and the application of electrogenerated chemiluminescence analytical technique was reviewed.In chapter 2, two water-insoluble iridium complexes were successfully modified onto the glassy carbon electrode through carbon nano-tube and Nafion composite film to compose a new ECL sensor. In this chapter, the luminescent mechanism of the modified electrode and the ECL signal of the modified electrode in different amine solution were studied. This method was used for the determination of the codeine in aqueous solution. The results demonstrated that this method would potentially facilitate the applications of these organic-soluble Ir(Ⅲ) luminescent materials in ECL based aqueous analytical fields.In chapter 3, phenanthroline ruthenium(Ⅱ) complexes and its derivatives have a higher electrogenerated chemiluminescence efficiency compared with tri-bipyridyl ruthenium based on literature reported. So a new complex [Ru(phen)2(np)]Cl2 (phen=phenanthroline, np= naphtho[2,3-f][1,10]phenanthroline) was designed and synthesized, and the electrochemical and electrogenerated chemiluminescence properties of this complex in aqueous solution were studied. Combined with nanotechnology, the new complex was successfully modified on the ITO electrode to obtain a new ECL sensor which has good stability to detect ractopamine hydrochloride.In chapter 4, electrochemical and electrogenerated chemiluminescence properties of two new water-soluble rhenium(Ⅰ) carbonyl complexes were investigated. In our research, the luminescent mechanism and the effect of different surfactants on the electrogenerated chemiluminescence intensity were discussed. The result showed the ECL intensity increased a lot after addition of TritonX-100 into the aqueous solution of rhenium(Ⅰ) complexes when an Au electrode was used as the working electrode. This phenomenon provided a potential application of the rhenium(Ⅰ) complexes used as electrogenerated chemiluminescence probe in the analytical fields.