Photocurrents in Thin Polymeric Films. Chromophore/Quencher Assemblies Based onPolypyrrole

摘要

Molecular-level photoconversion processes based on electron-transfer quenching ofmetal to ligand charge transfer (MLCT) excited states in solution are well established. The metal-complex-based systems offer the advantages of relatively high stability and rapid electron-transfer rate constants. In appropriately designed systems, transiently stored redox energy can be produced as a redox pair such as Ru(bpy)33+ + PO+, at or near the energy of the original excited state with per photon absorbed quantum efficiencies that can approach unity. In these simple solution systems, there is no spatial control over the photoproduced oxidative and reductive equivalents and the redox energy is stored only transiently because of recombination by back electron transfer.