Robust Benzo[g, h, i ]perylenetriimide Dye-Sensitized Electrodes in Air-Saturated Aqueous Buffer Solution

Highly electron deficient benzo[ghi]perylenetriimide (BPTI) chromophores were persistently anchored to a metal oxide electrode surface and reversible formation of their radical anions was shown in air‐saturated aqueous buffer solution. Our results show a very low reaction‐rate constant of BPTI.− with O2 (k=1.92±0.05×10−2 s−1). BPTI is a robust chromophore that can be used as the electron acceptor in molecule‐based artificial photosynthetic devices for direct water splitting in aqueous phase. Benzo[g, h, i ]perylenetriimide (BPTI) chromophores were persistently anchored to a TiO2 electrode surface, and their radical anions are shown to be stable for many seconds in air‐saturated aqueous buffer solution. Long‐term chemical stability of the BPTI‐sensitized electrode was observed in aqueous solution with reactive oxygen species.