Highly Efficient Conversion of Homocoupling and Heterocoupling of Terminal Alkynes Catalyzed by AuCu₂₄/AC‐200

Abstract

Abstract Regulation of Hybrid Materials of Ministry of Education, Bimetallic nanoclusters with synergistic effect exhibit better stability and activity than monometallic nanoclusters in catalytic applications. However, the large number of ligands on the surface of nanoclusters obscure the active sites, thus reducing the catalytic activity. Here, AuCu 24 /AC−X (X=0, 200, 300, 500, 800) catalysts were fabricated by removing the partial ligands on the surface of AuCu 24 H 22 ((p‐FPh) 3 P) 12 nanoclusters (short for AuCu 24 NCs), and investigated the influence of calcination temperature on catalytic performance of AuCu 24 /AC in homocoupling and heterocoupling of terminal alkynes. The results showed that the catalytic activity of AuCu 24 /AC−X exhibited a volcanic trend with the increase of X (heat treatment temperature) and the content of Cu 2+ also changed with the increase of X. Compared with Au 25 /AC‐200 and Cu 25 /AC‐200 catalysts, the AuCu 24 /AC‐200 bimetallic catalyst showed the highest catalytic activity in homocoupling and heterocoupling of terminal alkynes under mild conditions with TOF values reaching 478.7 h −1 and 114.1 h −1 respectively, which are higher than most reported catalysts. This work provides a research idea for the design of bimetallic nanoclusters with superior performance.