A thienyl‐benzodithiophene‐based two‐dimensional conjugated covalent organic framework for fast photothermal conversion

Two-dimensional conjugated covalent organic frameworks (2D c-COFs) are emerging semiconductor materials for optoelectronic and photothermal applications. In particular, the highly tailorable, semiconducting thiophene-based 2D c-COFs have attracted considerable interest due to their nontrivial physicochemical properties such as photo-activity, broad optical absorption, tunable electronic structures, so forth. Herein, we demonstrate a novel, crystalline c-COF based on thienyl-functionalized benzodithiophene (BDT) biphenyl (BP) via Schiff-base polycondensation reaction. The resultant BDT-BP-COF exhibits absorption up ca. 600 nm decent π-conjugation along polymer skeleton, revealed by theoretical calculations. favorable abundant electron-rich thiophene units confer excellent photo-activity towards usage of solar energy. As proof-of-concept application, explore in conversion, which it shows fast surface-temperature increase upon light irradiation seconds.