Pyrene‐ and Bipyridine‐based Covalent Triazine Framework as Versatile Platform for Photocatalytic Solar Fuels Production

Covalent Triazine Frameworks for enhanced photocatalysis: Pyrene-triazine-bipyridine donor-acceptor-acceptor triad CTF enables highly efficient photocatalytic hydrogen evolution from water with a production rate of 61.5 mmol/h/g_cat. Functionalization of the CTF with an organometallic rhodium complex allows for photocatalytic carbon dioxide reduction into formic acid with a rate of 130 μmol/h/g_cat.

Abstract

The ability to molecularly engineer materials is a powerful tool toward increasingly performing heterogeneous catalysts. Porous organic polymers stand out as photocatalysts due to their high chemical stability, outstanding optoelectronic properties and their easy and tunable syntheses. In photocatalysis, the insertion of photosensitizing π-extended molecules into molecularly well-defined donor-acceptor junctions is supposed to increase the catalytic activity, but yet remain experimentally underdeveloped. This study presents a pyrene-based Covalent Triazine Framework (CTF) synthesized through a polycondensation approach, which was designed to contain a molecularly-defined pyrene-triazine-bipyridine donor-acceptor-acceptor triad as the repetition unit of the CTF. The CTF is an efficient photocatalyst for hydrogen evolution from water reaching a significant production rate of 61.5 mmol_H2/h/g_cat. Moreover, the same CTF can easily be used as porous macroligand for an organometallic Rh complex to efficiently catalyze the carbon dioxide photoreduction into formic acid under visible light.

Zum Volltext