87 × 104 h1. Their catalytic activity was three- to tenfold higher than that of their unbound counterparts. These hybrid catalysts could be dissolved and precipitated. They could be quantitatively recovered and effectively recycled 15 times without significant loss of reactivity. The recovered Au NP-supported palladium could be also dissolved, precipitated and isolated. Various spectroscopic analyses were
固定在Au纳米颗粒(NPs)表面上的
钯络合物的负载量通过与负载的配位体
配体(SL = S(CH 2)11 NHP(O)(2-py)2)配位来控制,以生成组成(RS)x Au(SL)y(SL–PdCl 2)z(SR = S(CH 2)7 CH 3;x:y:z =(0.31–2.3):1:(0.45–3.3)),直径为3.1–4.9 nm。一小部分受支持的间隔基
配体(占23–69%)未被封盖,以捕获因浸出而产生的任何可溶性Pd物质。这些表面结合的Pd(II)络合物催化剂对
碘代苯和
丙烯酸烷基酯的Heck反应非常有效,最大转换频率(TOF)为4.87×10 4 h 1。它们的催化活性比未结合的同类催化剂高三至十倍。这些杂化催化剂可以溶解和沉淀。它们可以定量回收并有效回收15次,而不会显着降低反应活性。回收的
金纳米颗粒负载的
钯也可以溶解,沉淀和分离。进行了各种光谱分析,以确定(RS)x Au(SL)1(SL-Pd