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用UV -vis、FT- IR光谱研究了HAuCl4 和酯端基聚酰胺胺 (PAMAM)树形分子在N ,N -二甲基甲酰胺 (DMF)溶剂中的相互作用 ,提出HAuCl4 与树形分子之间的络合机理 :[AuCl4 ]- 离子与质子化叔胺基团形成离子对 ,Au3+ 离子与PAMAM树形分子上的酯基和酰胺基团形成配位作用。在DMF溶剂中酯端基PAMAM树形分子与HAuCl4 配位后用柠檬酸钠还原形成金纳米粒子 ,UV- vis光谱和TEM图像分析表明了随树形分子代数的增加 ,金纳米粒子的直径减小 ,并提出了树形分子 金纳米复合物的结构模型 :(1)较低代数的树形分子环绕在金粒子的外围 ;(2 )在较高代数的树形分子空腔内部封装金纳米粒子。
The interaction between HAuCl4 and PAMAM dendrimer in N, N-dimethylformamide (DMF) solvent was studied by UV-VIS and FT-IR spectroscopy. It was suggested that HAuCl4 and dendrimer The complexation mechanism between [AuCl4] - ions and the protonated tertiary amine group forms an ion pair, and the Au3 + ions form a coordination function with the ester and amide groups on the PAMAM dendrimer. In the DMF solvent, the PAMAM dendrimer terminated with HAuCl4 was reduced with sodium citrate to form gold nanoparticles. UV-vis spectra and TEM image analysis showed that with the increase of dendrimer algebra, the diameters of gold nanoparticles decreased (1) the lower algebraic dendrimer surrounds the periphery of gold particles; (2) the gold nanostructures are encapsulated inside the higher algebraic dendrimer cavity particle.