Water- and organo-dispersible gold nanoparticles supported by using ammonium salts of hyperbranched polystyrene: Preparation and catalysis

Lei Gao, Takashi Nishikata, Keisuke Kojima, Katsumi Chikama, Hideo Nagashima

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Gold nanoparticles (1 nm in size) stabilized by ammonium salts of hyperbranched polystyrene are prepared. Selection of the R groups provides access to both water- and organo-dispersible gold nanoparticles. The resulting gold nanoparticles are subjected to studies on catalysis in solution, which include reduction of 4-nitrophenol with sodium borohydride, aerobic oxidation of alcohols, and homocoupling of phenylboronic acid. In the reduction of 4-nitrophenol, the catalytic activity is clearly dependent on the size of the gold nanoparticles. For the aerobic oxidation of alcohols, two types of biphasic oxidation are achieved: one is the catalyst dispersing in the aqueous phase, whereas the other is in the organic phase. The catalysts are reusable more than four times without loss of the catalytic activity. Selective synthesis of biphenyl is achieved by the homocoupling of phenylboronic acid catalyzed by organo-dispersible gold nanoparticles.

Original languageEnglish
Pages (from-to)3152-3163
Number of pages12
JournalChemistry - An Asian Journal
Volume8
Issue number12
DOIs
Publication statusPublished - Dec 2013

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Organic Chemistry

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