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Issue 5, 2014
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Unconventional Pd nanoparticles' growth induced by a competitive effect between temperature-dependent coordination and reduction of grafted amino ligands for Heck reaction

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Abstract

A useful and interesting unconventional phenomenon of Pd nanoparticle formation, i.e., significantly inhibited particle growth at elevated temperatures, has been observed for the first time by growing Pd nanoparticles on a type of nonreactor, amino group-functionalized hollow mesoporous silica nanoparticles (amino-HMSNs). Such an unconventional effect is evidenced to be a competitive result between temperature-dependent coordination and reduction action of amino groups on the shell of HMSNs based on a series of experiments of probing the coordination and reduction capability of the amino groups to a Pd precursor K2PdCl6. A possible mechanism has been proposed to demonstrate and clarify the unconventional growth of Pd nanoparticles on the shell of amino-HMSNs. The as-synthesized Pd nanoparticles on the amino-HMSNs, therefore, show a tunable temperature-dependent small size range (<10 nm) and high dispersity, and can be used as efficient Heck reaction catalysts. Such a finding of unconventional particle growth effect may offer a novel protocol for particle size modulation during materials design and fabrication.

Graphical abstract: Unconventional Pd nanoparticles' growth induced by a competitive effect between temperature-dependent coordination and reduction of grafted amino ligands for Heck reaction

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Article information


Submitted
17 Oct 2013
Accepted
14 Nov 2013
First published
15 Nov 2013

J. Mater. Chem. A, 2014,2, 1515-1523
Article type
Paper

Unconventional Pd nanoparticles' growth induced by a competitive effect between temperature-dependent coordination and reduction of grafted amino ligands for Heck reaction

K. Zhang, H. Chen, X. Zhou, Y. Gong, G. Zhang, X. Wang, Y. Chen and J. Shi, J. Mater. Chem. A, 2014, 2, 1515
DOI: 10.1039/C3TA14171C

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