以PAMAM树形分子为模板制备Pd纳米簇合物

高等学校化学学报 ›› 2009, Vol. 30 ›› Issue (7): 1459.

以PAMAM树形分子为模板制备Pd纳米簇合物

卢文婷, 罗运军, 李国平, 张欣茜, 靳玉娟

北京理工大学材料科学与工程学院, 北京 100081

收稿日期:2008-10-10 出版日期:2009-07-10 发布日期:2009-07-10
通讯作者: 罗运军, 男, 博士, 教授, 博士生导师, 主要从事高分子材料和含能材料的研究. E-mail: yjluo@bit.edu.cn

Preparation and Characterization of Pd Nanoclusters Templated by PAMAM Dendrimers

LU Wen-Ting, LUO Yun-Jun*, LI Guo-Ping, ZHANG Xin-Qian, JIN Yu-Juan

School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China

Received:2008-10-10 Online:2009-07-10 Published:2009-07-10
Contact: LUO Yun-Jun. E-mail: yjluo@bit.edu.cn

摘要/Abstract

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2 nm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.

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

Abstract:

Pd nanoclusters templated by methoxycarbonyl-terminated poly(amidoamine)(PAMAM) dendri-mers were successfully prepared in methanol. The complexation between Pd²⁺ ions and dendrimers was investigated by UV-Vis and FTIR spectophotometric method. These results show that Pd²⁺ 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.

Key words: Poly(amidoamine)(PAMAM) dendrimer; Template method; Pd nanocluster; Complexation

TrendMD:

卢文婷, 罗运军, 李国平, 张欣茜, 靳玉娟. 以PAMAM树形分子为模板制备Pd纳米簇合物. 高等学校化学学报, 2009, 30(7): 1459.

LU Wen-Ting, LUO Yun-Jun*, LI Guo-Ping, ZHANG Xin-Qian, JIN Yu-Juan. Preparation and Characterization of Pd Nanoclusters Templated by PAMAM Dendrimers. Chem. J. Chinese Universities, 2009, 30(7): 1459.

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