Desactivación de la fotoluminiscencia de un complejo de rutenio anclado a nanocristales de dióxido de titanio empleando cobaloximas

Abstract

The quenching of the excited state of [Ru(deeb)(bpy)2] (PF6)2 where bpy is 2,2'-bipyridine and deeb is 4,4'-(COOEt)2-2,2'-bipyridine was studied in fluid acetonitrile solution and anchored to nanocrystalline titanium dioxide thin films. To quench the excited state, the cobaloximes [Co(py)(Cl)(dmgH)2] and [Co(py)(Bu)(dmgH)2] where py is pyridine, Bu is n-butyl and dmgH is dimethylglyoximate were used. These cobaloximes are efficient quenchers of the excited state both in fluid solution and when the ruthenium complex is bound to titanium dioxide. The quenching process can be adequately described using the Stern-Volmer model, which indicates that quenching is dominated by diffusion processes and is coherent with a photo induced electron transfer process.