The field of nanomaterials has been getting more attention the last few decades because of their unique optical, electrical and physical properties compared to those of bulk materials of the same type. One of the most studied nanomaterials is colloidal metal nanoparticles (NP) because of the tunability to control their structural parameters such as core size, shape, and chemical functionality using organic capping ligands. The head group of these ligands interacts with the surface of the metal nanoparticle whereas the organic chain of the ligand prevents aggregation and the terminal group controls the chemical properties such as solubility and chemical interactions. The synthesis of water-soluble alkanethiolate-capped palladium nanoparticle (PdNP) was achieved using the thiosulfate protocol developed by our group. The produced PdNP is characterized by transmission electron microscopy (TEM), thermogravimetric analysis (TGA), 1H NMR and UV-Vis Spectroscopy.
The adsorption of metal nanoparticles on semiconductor supports has recently been studied increasingly for the application of hybrid nanoparticles in photocatalysis or photo-enhanced catalysis. Titanium oxide (TiO2) is one of the most common semiconductors that have been used for photo-enhanced catalysis. Herein, we investigated the influence of TiO2 particles on the activity and selectivity of colloidal palladium nanoparticle (PdNP) for the hydrogenation and/or isomerization of 1-allyl-2-bromobenzene. In addition, we examined the catalytic reactions of allyl benzene to see the effect of steric hindrance in the overall conversion of the starting material caused by the bromine group. The results suggested that the presence of the bromine group in the ortho-position causes a dramatic decrease in the catalytic activity of PdNP. Furthermore, the catalysis results indicated a strong potential of PdNP for an Anti-Markovnikov Wacker oxidation of terminal alkenes to aldehydes under mild conditions. A plausible mechanism was developed in order to elucidate the conditions for the Anti-Markovnikov Wacker oxidation reaction.
|Commitee:||Li, Lijuan, Derakhshan, Shahab|
|School:||California State University, Long Beach|
|Department:||Chemistry and Biochemistry|
|School Location:||United States -- California|
|Source:||MAI 82/4(E), Masters Abstracts International|
|Keywords:||Catalysis, Steric hindrance, Wacker Oxidation, Water-soluble Palladium Nanoparticles, Nanomaterials|
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