以PAMAM树形分子为模板制备Pd纳米簇合物  

Preparation and Characterization of Pd Nanoclusters Templated by PAMAM Dendrimers

作　　者：卢文婷[1] 罗运军[1] 李国平[1] 张欣茜[1] 靳玉娟[1] 

机构地区：[1]北京理工大学材料科学与工程学院,北京100081

出　　处：《高等学校化学学报》2009年第7期1459-1463,共5页Chemical Journal of Chinese Universities

摘　　要：以酯端基聚酰胺-胺树形分子(PAMAM)为模板在甲醇溶剂中制备了Pd纳米簇合物.采用紫外-可见分光光度法和红外光谱法研究了Pd2+与树形分子的作用机理,结果表明,Pd2+与树形分子内部胺基基团(主要为叔胺基)产生了络合作用.采用硼氢化钠还原法制备了树形分子包裹的、粒径为2nm的球形面心立方Pd纳米簇合物.紫外-可见吸收光谱研究结果表明,Pd2+与树形分子的摩尔比越小,生成的纳米簇合物尺寸越小;由于高代数树形分子具有封闭结构,且其内部配体数目较多,采用较高代数的树形分子(5.5代)比低代数(3.5代)更有利于得到尺寸小、分散性较好的Pd纳米簇合物.Pd nanoclusters templated by methoxycarbonyl-terminated poly （amidoamine） （PAMAM） dendrimers were successfully prepared in methanol. The complexation between Pd^2＋ ions and dendrimers was investigated by UV-Vis and FTIR spectophotometric method. These results show that Pd^2＋ ions are coordinated with the interior amine groups of PAMAM dendrimers. As shown in HRTEM images, reduction with NaBH4 resulted in well-dispersed and nearly size monodisperse Pd nanoclusters（2 nm, FCC） encapsulated in dendrimers. The investigation of UV-Vis data indicates that the size of particle increases with the metal-to-dendrimer molar ratio. Besides, due to the close-packed spherical periphery and rich ligands in interior cavities, dendrimers of higher generation are more effective for preparing Pd DENs with smaller size and better dispersion.

关 键 词：聚酰胺-胺(PAMAM)树形分子 模板法 Pd纳米簇合物 络合作用 

分 类 号：O633.22[理学—高分子化学] O614[理学—化学]