Tuning the catalytic activity of cyclodextrin-modified palladium nanoparticles through host-guest binding interactions

Jian Liu, Julio Alvarez, Winston Ong, Esteban Román, Angel E. Kaifer

Research output: Contribution to journalArticle

87 Scopus citations

Abstract

Water-soluble Pd nanoparticles (diameter 3.5 ± 1.0 nm) modified with covalently-attached cyclodextrin (CD) receptors were prepared by the reduction of PdCl42- in dimethylformamide solution containing perthiolated β-CD. These Pd nanoparticles behave as active catalysts for the hydrogenation of alkenes in aqueous media. For instance, the turnover frequency for the hydrogenation of 1-butenyltrimethylammonium bromide (1) was found to be 320 (moles of 1) (moles of Pd)-1 h-1 at 25 °C and 1.0 atm of H2(g). The addition of cationic ferrocene derivatives, such as ferrocenylmethyltrimethylammonium bromide (3), to the reaction medium decreases the catalytic activity of the Pd nanoparticles. Other CD substrates, such as anionic ferrocene derivatives or neutral adamantanol, are much less effective as inhibitors of the catalytic hydrogenation process.

Original languageEnglish (US)
Pages (from-to)6762-6764
Number of pages3
JournalLangmuir
Volume17
Issue number22
DOIs
StatePublished - Oct 30 2001

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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