Aqueous Phase Synthesis of Palladium Tripod Nanostructures for Sonogashira Coupling Reactions

作者：Chu Yi Ting; Chanda Kaushik; Lin Po Heng; Huang Michael H^*

来源：Langmuir, 2012, 28(30): 11258-11264.

DOI：10.1021/la302284m

In this work, palladium tripod nanocrystals have been synthesized by mixing an aqueous solution of cetyltrimethylammonium bromide (CTAB) surfactant, Na2PdCl4, copper acetate, and ascorbic acid at 30 degrees C for 3 h. Addition of a small amount of copper ion source is critical to the formation of these tripods with a pod length reaching 100 nm. The incorporation of Cu atoms into the Pd tripods has been verified. The entire Pd tripod is single-crystalline with their branches growing along the [111] and [200] directions. Formation of side branches can be observed in some tripods. Triangular nanoplates are initially formed and evolved into the tripod structure in 20-30 min of reaction. Further growth leads to elongation of the pods. The large Pd tripods can serve as active and recyclable catalysts for a broad range of Sonogashira coupling reactions in water using a variety of aromatic halides containing electron-donating and -withdrawing substituents.

• 出版日期2012-7-31
• 单位清华大学