Heterogeneous visible-light photoredox catalysis with NiCl2@g-C3N4 for induced C(sp2)-H/N H cross-dehydrogenative coupling
Year: 2024
Type: article
Abstract: A novel photoactive NiCl 2 @g-C 3 N 4 catalyst system, which effectively drives C(sp 2 )-H/N H bond formation between quinolin-2(1 H )-ones, primary and secondary aliphatic amines under blue light irradiation. The NiCl 2 @g-C 3 N 4 composite with a NiCl 2 loading of 0.7wt% had the highest photoactivity, and the calculated band gap energy value is 2.56 eV The nickel ion could act as an electron acceptor enhancing carrier separation and transfer efficiency, greatly enhanced the photoreaction efficiency of g-C 3 N 4 . Preliminary mechanistic studies indicate upon visible light irradiation, the photo-generated electrons and holes act as oxidants, thereby generating amine radicals in the absence of external chemical oxidants. This provides a straightforward and efficient approach for directly 3-aminating quinoxalines-2(1 H )-ones. Moreover, the heterogeneous catalyst can be recycled at least six times without significant activity loss.
Source: Molecular Catalysis
Institution: Fujian Medical University
Language: English
Subfield: Organic Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,110
OpenAlex ID: W4403751157