A series of novel π-extended chalcogenoviologens with stable radical states, narrow band gaps and low reduction potentials were synthesized. These compounds can be used as photosensitizers and electron mediators for excellent visible-light-driven photochromism and hydrogen evolution due to their strong absorption in the visible region and fast electron transfer properties. Particularly, Se-PhV2+ showed the highest value reported to date for viologen-based visible-light-driven hydrogen evolution.

原文链接：https://pubs.rsc.org/en/content/articlelanding/2020/ta/d0ta02930k