Energetic requirements of iridium(iii) complex based photosensitisers in photocatalytic hydrogen generation

Abstract

A new family of Ir(III) complexes were synthesised and employed as light-induced hydrogen-production photosensitisers in aqueous systems, where hydrogen evolution was observed only when the PS* was reduced by the sacrificial agent, NEt₃, signifying that a minimum potential difference of >0.2 V between E(PS*/PS⁻) and E(NEt₃⁺/NEt₃) is required for efficient hydrogen production [i.e., E(PS*/PS⁻) >1.19 V versus NHE]. The analytical method developed here is demonstrated to be useful for screening new photosensitisers for light-driven hydrogen generation.