Abstract
This study has been undertaken to investigate the UV irradiation effect on catalytic activities in Pd-catalyzed cross coupling reactions. A Pd-TiO2-CNT composite was prepared by a previously reported sol-gel method, whereby anatase TiO2 and metallic Pd nanoparticles were deposited onto the surface of carbon nanotubes (CNTs). The average particle size of these nanoparticles was determined to be ∼4.3nm by transmission electron microscopy. The prepared Pd-TiO2-CNT material was employed as a catalyst for the Heck and decarboxylative coupling reactions, and it showed higher catalytic activity in the presence of UV irradiation than in the absence of UV irradiation. The enhanced catalytic activity of this system can be explained by the increased nucleophilicity of Pd due to electron transfer from TiO2 under UV irradiation.
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