1-methylimidazole Stabilization Of Gold Nanoparticles In Imidazolium Ionic Liquids

摘要

Low levels of 1-methylimidazole additives have been found to have dramatic effects on the resulting stability of gold and bimetallic nanoparticles in ionic liquids (ILs).rnThe field of quasi-homogeneous catalysis involves the use of nanoparticle catalysts which are typically solubilized in a liquid media. One of the great challenges in this area is to find routes towards the stabilization of nanoparticles while preventing passivation of the catalytic nanoparticle surface. There has been a great deal of interest in imidazolium-based room temperature ionic liquids (ILs) as the reaction media for quasi-homogeneous catalysts, as a number of groups have reported that nanoparticles can be solubilized in ILs in the absence of additional stabilizer(s). Several groups have indicated that nanoparticle stabilization in ILs may be due to weak anion or cation interactions with the nanoparticle surfaces, or alternatively, that the presence of impurities such as water and halides may play a significant role on nanoparticle stability in IL solvents.