PH-Driven Mechanistic Switching from Electron Transfer to Energy Transfer between [Ru(bpy)₃]²⁺ and Ferrocene Derivatives.

ABSTRACT: The metal-to-ligand charge transfer excited states of [Ru(bpy)₃]²⁺ (bpy = 2,2'-bipyridine) may be deactivated via energy transfer or electron transfer with ferrocene derivatives in aqueous conditions. Stern-Volmer quenching analysis revealed that the rate constant for [Ru(bpy)₃]²⁺ excited-state quenching depends on solution pH when a ferrocenyl-amidinium derivative (Fc-am) containing a proton-responsive functionality tethered to the ferrocene center was present. By contrast, the rate constant with which the [Ru(bpy)₃]²⁺ excited state is quenched by an analogous ferrocene derivative (ferrocenyl-trimethylammonium, Fc-mam) that lacks a protonic group does not depend on pH. These results show that the presence (or absence) of a

SUBMITTER: Drolen C 

PROVIDER: S-EPMC6192533 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature