hydrophobic layer generated by the ligand 1 on the particle
surface strongly affect the catalytic activity of our Pd NPs.
Fiedler, and F. Nome, J. Org. Chem., 2014, 79, 2574.
22 N. Toshima and T. Takahashi, Bull. Chem. Soc. Jpn.,
1992, 65, 400.
In conclusion, for the first time we have easily and
successfully prepared Pd NPs stabilized by aromatic ligand
molecules with Pd-C bonds by NaBH4 reduction of a Pd salt.
The average particle size is ca. 27 nm which is much larger
than the reported Pd NPs prepared by similar chemical
reduction. But these Pd NPs can be re-dispersed in water.
These Pd NPs showed a good performance as an effective
catalyst for Suzuki-Miyaura coupling reaction in water even
their sizes are relative large. These phenomena can be
attributed to the hydrophobic layer on the particle surface,
where the substrate can be concentrated.
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Acknowledgement
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This work is partially supported by Hokkaido University.
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