Electron injection into titanium dioxide by panchromatic dirhodium photosensitizers with low energy red light

Abstract

Two new Rh₂(II,II) dyes were synthesized and anchored to TiO₂ for charge injection upon irradiation. The ¹ML-LCT (metal/ligand-to-ligand charge transfer) excited state is populated upon excitation, which decays to the corresponding ³ML-LCT state. Ultrafast electron injection into TiO₂ from the Rh₂(II,II) dyes was achieved with low energy, red light excitation.