PtCu@Ir-PCN-222: Synergistic Catalysis of Bimetallic PtCu Nanowires in Hydrosilane-Concentrated Interspaces of an Iridium(III)–Porphyrin-Based Metal–Organic Framework
Chunying Chen, Qijie Mo, Jia Fu, Qingyuan Yang, Li Zhang, Cheng‐Yong Su
Abstract
Hydrosilanes are useful precursors for the preparation of many different silicon-containing molecules, and they are transformed into value-added molecules generally through Si–H bond activation. Herein, we report the synthesis of a series of porphyrinic metal–organic framework (MOF) composites that were encapsulated with bimetallic PtCu nanowires (PtCu@Ir-PCN-222) and their catalytic performances toward Si–H bond functionalization. Catalytic results showed that PtCu@Ir-PCN-222 was efficient for the hydrolytic oxidation of hydrosilane and CO2 hydrosilylation. Especially, the turnover number in PtCu@Ir-PCN-222-catalyzed hydrosilane oxidation was up to 27,857 based on Pt. Theoretical studies disclosed that Ir(III) porphyrin might interact with hydrosilane via a η2-(H–Si) coordination model, and meanwhile, PtCu alloys displayed higher Si–H activation ability than the sole Pt nanoparticles because of the well-tuned Pt and Cu electronic structures in the bimetallic PtCu nanowires.