β-Cyclodextrin-Silica Hybrid: A Spatially Controllable Anchoring Strategy for Cu(II)/Cu(I) Complex Immobilization

Federica Calsolaro, Katia Martina, Elisa Borfecchia, Fernando Chávez-Rivas, Giancarlo Cravotto, Gloria Berlier

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The development of new strategies for spatially controllable immobilization has encouraged the preparation of novel catalysts based on the organic-inorganic hybrid concept. In the present paper, a Cu-based multi-structured silica catalyst has been prepared and fully characterized. The inclusion of Cu(II) in β-cyclodextrins has been exploited with the double aim to stabilize the metal and to act as a source of Cu(I) catalytic sites. Multi-technique characterization by infrared, UV-visible, electron microscopy and X-ray absorption spectroscopies of the fresh and exhaust catalysts provided information on the local structure, redox properties and stability of the investigated hybrid systems. The catalytic system showed that copper nanospecies were dispersed on the support and hardly affected by the catalytic tests, confirming the stabilizing effect of β-CD, and likely of the N1-(3-Trimethoxysilylpropyl) diethylenetriamine spacer, as deduced by X-ray absorption spectroscopy analysis. Overall, we demonstrate a feasible approach to efficiently anchor Cu(II) species and to obtain a reusable single-site hybrid catalyst well suited for Cu(I)-catalyzed alkyne-azide cycloaddition.

Original languageEnglish
Article number1118
Pages (from-to)1-16
Number of pages16
JournalCatalysts
Volume10
Issue number10
DOIs
StatePublished - Oct 2020

Keywords

  • Copper-catalysis
  • Diffuse reflectance UV-visible
  • Green chemistry
  • Infrared spectroscopy
  • Organic-inorganic hybrid material
  • Silica
  • X-ray absorption spectroscopy
  • β-cyclodextrin

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