Aggregation of Ionic Liquid in Chloroform and Its Application in The Synthesis of Metal Nanoparticles for Use as Catalyst

• Main Authors: Hsin-chieh Yang, 楊欣婕
• Other Authors: Liu, Ling-Kang
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/76512895182155082641

碩士 === 國立中央大學 === 化學研究所 === 98 === Abstract Ionic liquid (IL) is a very popular medium which has been explored in recent years. It has been widely employed in various research fields. Nanoscale transition metal catalysts have also attracted increasing intrests. It has been mainly the study of special physical and chemical properties of ILs in order to make use of metal ions. Alternatively, ILs can prevent the metal nanoparticles from aggregation. Pd-nanoparticles and Au-nanoparticles were synthesized by UV irradiation or microwave heating of respective metal halide anions PdBr2 and HAuCl4 in CDCl3 solution of 1-butyl-3-ethyl-1H-imidazol-3-ium bromide ,chloride(4-2Br and 4-2Cl), respectively. The 4-2 Br IL with 10 mol % metal salt in chloroform ionic liquid clustering exhibits at increasing concentration of 4-2 Br. After UV or microwave irradiation, the metal nanoparticles produced could serve as the contrasting agent on the TEM images, to correlate the concentrations of IL with the aggregation phenomena of IL. On a separate study, fluorescent dyes of 3-hydroxy chromone derivatives 2-(6-diethylaminobenzo[b]furan-2-yl)-3-hydroxychromone (FA) and 2-(4-(dimethylamino)phenyl)-3-hydroxy-4H-chromen-4-one (CF) have been used to extract structural information from the luminescence and excitation spectra, which also reflect the the aggregation of ionic liquid in chloroform. The chloroform solution of 4-2 Br and 10% PdBr2 under UV or microwave irradiation generated the Pd nanoparticles in IL layer of 4-2 Br which also protected the size of Pd nanoparticles from growing too fast. These Pd nanoparticles in IL were used in the Heck reactions. Initially ionic liquid layer with Pd NPs was added with organic materials for the two-phase catalytic Heck reactions, which could be carried out under mild conditions. The combinations of Pd nanoparticles and the IL conforms to goals of green chemistry in reducing environmental damages.