Pd nanoparticle aging and its implications in the Suzuki cross-coupling reaction

被引：90

作者：

Hu, J ^{[1
]}

Liu, YB ^{[1
]}

机构：

[1] Univ Akron, Dept Chem, Akron, OH 44325 USA

来源：

LANGMUIR | 2005年 / 21卷 / 06期

关键词：

D O I：

10.1021/la0471902

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Examination of the catalysts recovered in the N,N-dihexylcarbodiimide-palladium nanoparticle composite catalyzed Suzuki cross-coupling reactions revealed that the metal nanoparticles transformed gradually from spherical-shape to larger needle-shaped crystals. Two types of Ostwald ripening processes were observed. One involves rapid aggregation of the incipient nanoparticle catalyst (2-5 nm) into blackberry-like assemblies (100-200 nm), which is accompanied with the much slower dissolution of small crystals or amorphous nanoparticles and the formation of larger needle-shaped crystals. The observed structural changes provided new insights into the durability of the polymer nanoparticle composite catalyst.

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页码：2121 / 2123

页数：3

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