Regioisomer-Directed Self-Assembly of Alternating Copolymers for Highly Enhanced Photocatalytic H Evolution.

Porphyrin-based photocatalytic materials have received great attention, and the effect of the substituents, central ions, and aggregated structure on the catalysis performance has been studied up to now. Herein, we report the effect of porphyrin isomerism on their aggregated structures as well as the photocatalytic activity. Two - and -porphyrin-based alternating copolymers with the same compositions ( and ) are successfully synthesized. It is found that self-assembles into propeller-like nanoparticles and into multilayer hollow nanospheres. Furthermore, the hydrogen production rate of (5533 μmol g h) is 30 times higher than that of (173 μmol g h). Mechanism studies reveal that the high photocatalytic properties of originate from the more ordered arrangement of porphyrins than , which facilitates the mobility and separation of photoinduced carriers. We believe the covalent and noncovalent polymer self-assembly process as well as the isomerism effect as disclosed here will shed new light on the design of high performance photocatalysts.