Photoredox Heterobimetallic Dual Catalysis Using Engineered Covalent Organic Frameworks

ACS Catal. 2021 Oct 1;11(19):12344-12354. doi: 10.1021/acscatal.1c03634. Epub 2021 Sep 21.

Abstract

The functionalization of an imine-based layered covalent organic framework (COF), containing phenanthroline units as ligands, has allowed the obtention of a heterobimetallated material. Photoactive Ir and Ni fragments were immobilized within the porous structure of the COF, enabling heterogeneous light-mediated Csp3-Csp2 cross-couplings. As radical precursors, potassium benzyl- and alkoxy-trifluoroborates, organic silicates, and proline derivatives were employed, which brings out the good versatility of Ir,Ni@Phen-COF. Moreover, in all the studied cases, an enhanced activity and stability have been observed in comparison with analogous homogenous systems.