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聚(N-乙烯基-2-吡咯烷酮)稳定的金簇合物(Au:PVP)的质谱结果表明,来源于合成前驱体的Cl吸附质主要存在于Au_(34)和Au_(43)簇合物上.金簇合物上Cl吸附质的数量不影响其催化有氧苯甲醇氧化性能,表明Cl原子与Au簇合物间存在较弱的键合作用.相反,用Br替代Au_(34)和Au_(43)簇合物上Cl显著抑制了其催化活性,但对其电子结构没有任何影响.这表明,Br原子与金簇合物的键合较强,在空间上堵塞了活性位.因Br吸附质而导致活性显著下降表明,Au_(34)和Au_(43)簇合物对Au:PVP催化活性起主要贡献.
The mass spectra of the poly (N-vinyl-2-pyrrolidone) -based gold cluster (Au: PVP) show that Cl adsorbates derived from synthetic precursors mainly exist in Au 34 and Au 43 clusters The amount of Cl adsorbate on the gold cluster did not affect the catalytic oxidation of the oxygenated benzyl alcohol, indicating weak bonding between the Cl atom and the Au cluster.In contrast, Cl and Au_ (43) clusters significantly inhibited their catalytic activity but had no effect on their electronic structure, indicating that Br atoms bound strongly to the gold clusters and spatially blocked the active sites. The significant decrease in activity due to the Br adsorbate indicates that the Au_ (34) and Au_ (43) clusters play major roles in the catalytic activity of Au: PVP.