Eosin Y-Containing Metal-Organic Framework as a Heterogeneous Catalyst for Direct Photoactivation of Inert C-H Bonds br

Xanthene dyes as a class of ideal organic homogeneous photocatalyst have received significant attention in C-Hbond activation; however, the inherent nature of fast carrier recombination/deactivation and low stability limits their practicalapplications. Herein, by the ingenious decoration of eosin Y into a porous metal-organic framework (MOF), a high-performanceheterogeneous MOF-based photocatalyst was prepared to efficiently activate inert C-H bonds on the reactants via the hydrogenatom transfer pathway for the functionalization of the C-H bonds. Taking advantage of thefixation effect of a rigid framework, theincorporation of eosin Y into MOF leads to great enhancement of their chemical durability. More importantly, by the introduction ofthe second auxiliary ligand, the carbonyl groups of xanthene on the eosin Y dyes were perfectly retained and periodically alignedwithin the confined channels of this rigid framework, which could effectively form excited state radicals to prompt inert C-H bondactivation, promoting reaction efficiency by the host-guest supramolecular interaction. New eosin Y-based MOFs were recyclablefor six times without reducing photocatalytic activity. This eosin Y functionalized MOF-based heterogeneous photocatalytic systemprovides an availably catalytic avenue to develop a scalable and sustainable synthetic strategy for the practical application of organicdyes.