Unveiling the effect of water on photoinduced electron transfer by crystallographic study.

A series of proof-of-concept models with different degrees of hydration in the same donor–acceptor system were obtained through a functional motif-oriented structural design and screening strategy. The effect of water molecules on photoinduced electron transfer was explored from a crystallographic perspective for the first time. The reasons for the structural differences caused by different degrees of hydration were also discussed. [ABSTRACT FROM AUTHOR]