Pyrylium-based porous organic polymers via Knoevenagel condensation for efficient visible-light-driven heterogeneous photodegradation

Pyrylium salts are a type of representative and convincing example of versatility and variety not only as a nodal point in organic transformations but also as an attractive building block in functional organic materials. Herein, we report an effective synthetic protocol to fabricate a new pyrylium-containing porous organic polymers (POPs), named TMP-P, via Knoevenagel condensation with 2,4,6-trimethylpyrylium salt (TMP) as the key building block and 1,4-phthalaldehyde as the linker. The resulting ionic polymer TMP-P exhibited efficient visible-light-driven heterogeneous photodegradation of Rhodamine B, owing to the presence of wide visible light absorption and a narrow optical band gap triggered pyrylium core in the framework. : A new ionic porous organic polymer (iPOP) was readily fabricated via Knoevenagel condensation with pyrylium salts as the key building block, which exhibited efficient visible-light-driven heterogeneous photodegradation of Rhodamine B.