A conjugated porous poly-benzobisthiadiazole network for a visible light-driven photoredox reaction

Photocatalysts, which absorb mainly in the visible range of light, have established notable prominence in applications such as water splitting, solar energy storage, and photovoltaics. Among these visible light-driven catalysts developed, rare metal complexes, especially ruthenium and iridium complexes have found large applications due to their commercial availability, excellent stability and photoredox properties. However, considering the high cost and toxicity of these rare metals, as well as their limited availability in nature, their sustainability still remains a huge challenge. There has been growing interest in developing metal-free visible light driven photocatalysts in recent years, where a vast number of organic chromophores and dyes were employed successfully in photoredox catalysis. In particular, uorescein, eosin Y, nile red, and rhodamine B have been studied intensely. A common drawback associated with most single molecule organic dyes is that they easily suffer from the solvolytic attack in the reaction medium, the so-called photo-bleaching. In addition, homogeneous catalysts generally can be troublesome to remove aer the reaction. Therefore, it is benecial to develop a new class of organic heterogeneous visible light driven photocatalysts with high stability and easy processability. Conjugated porous polymers, combining the photoactive p-electron backbone and porous surface properties, have been recently introduced as stable heterogeneous photocatalysts for