The Synthesis and Catalytic Application of Pyridinyl Groups Protecting Gold Nanoparticles

• Main Authors: Ching-Feng Fu, 傅勁逢
• Other Authors: 劉緒宗
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/35167713122418709680

碩士 === 國立臺灣大學 === 化學研究所 === 93 === Gold nanoparticle was firstly discovered by Faraday in 1857, but the knowledge of morphology and catalytic applications on these nanoparticles have not been developed until Transmission Electron Microscopy (TEM) was widely used in 1980s. We have synthesized a series of pyridinyl and bipyridinyl thiols as protecting agents to prepare gold and ruthenium nanoparticles. These nano particles were characterized by UV-Vis spectroscopy and TEM. These pyridinyl or bipyridinyl thiols protected nanoparticles were used as multiple dentates for transition metal complexes particularly with ruthenium (Ru) and palladium (Pd). Thus, coordination with metal ions took place on the surface of gold nanoparticles. It was found that the nanoparticles aggregrated upon the complexation, which led to the decrease of the intensity on surface plasma resonance band. As for the ruthenium bipyridinyl complexes on gold surface, its phosphorescence was quenched. Gold nanoparticles with different modified surfactants do affect the particle size, diversity, dispersity, stability, as well as acid-and-base resistance, which are discussed. The activity of the dentric protective gold nanoparticles in various catalytic reactions was screened. In particular, nanoparticles with pyridinyl-thiol groups protected appeared to be active on the conversion of benzyl alcohol into benzaldehyde in the presence of molecular oxygen.