Abstract
We report the controlled synthesis of small palladium nanoparticles (PdNPs) with narrow particle size distribution (1.8 ± 0.2 nm) using an organic molecular cage as a template. The well-defined cage structure and thioether anchoring groups inside the cavity are critical for the formation of narrowly distributed PdNPs, offering a confined organic molecular environment and guiding PdNP nucleation and growth. The resulting encapsulated PdNPs are resistant to agglomeration and stable in solution exposed to air at room temperature. When provided with a protective cage shell with minimum surface coverage, such PdNPs are capable of catalyzing organic reactions, showing high catalytic activity in Suzuki-Miyaura coupling reactions.
Highlights
Metal nanoparticles (NPs) have been widely applied in various disciplines of modern sciences, including catalysis,[1,2,3,4,5,6] diagnostic imaging,[7,8,9,10] sensing,[7,11] magnetic recording,[12] electronics[13] and optics.[14]
Cage 3a with a large internal void and pendant interior thioether anchoring groups was synthesized through dynamic imine chemistry from triamine 1 and dialdehyde 2a in one step (Scheme 1).[35]
The analogous cage 3b with methyl groups instead of thioether groups was synthesized for comparison
Summary
Metal nanoparticles (NPs) have been widely applied in various disciplines of modern sciences, including catalysis,[1,2,3,4,5,6] diagnostic imaging,[7,8,9,10] sensing,[7,11] magnetic recording,[12] electronics[13] and optics.[14]. We report the controlled synthesis of small palladium nanoparticles (PdNPs) with narrow particle size distribution (1.8 Æ 0.2 nm) using an organic molecular cage as a template.
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