Sulfone-decorated hypercrosslinked polymers for sacrificial light-driven hydrogen evolution from water.

Polymer photocatalysts have emerged as a versatile class of materials for solar-driven hydrogen evolution, offering tunable optoelectronic properties, structural diversity, and synthetic flexibility. Unlike inorganic semiconductors, polymer photocatalysts can be molecularly engineered to optimise light absorption, charge separation, and energy levels as well as porosity through precise control of their composition and architecture. One of the challenges of this material class is the fact that highly functionalised monomers are used, for example, multifunctional bromo and boronic acid compounds, which are then coupled using Suzuki-Miyaura polycondensation reactions that require Pd(0) catalysts. Similarly, highly active covalent organic frameworks require highly functionalised building blocks which are made using costly multi-step synthesis. Herein, we overcome this limitation of photoactive polymers by preparing swellable hypercrosslinked polymers (HCPs) that combine photocatalytic activity with high accessible surface areas, which are made using inexpensive monomers and not relying on noble metals for their synthesis. The HCPs contain dibenzo[