β-Cyclodextrin-Silica Hybrid: A Spatially Controllable Anchoring Strategy for Cu(II)/Cu(I) Complex Immobilization
| Autor: | Giancarlo Cravotto, Fernando Chávez-Rivas, Elisa Borfecchia, Gloria Berlier, Katia Martina, Federica Calsolaro |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Green chemistry
Materials science Absorption spectroscopy chemistry.chemical_element Infrared spectroscopy 010402 general chemistry lcsh:Chemical technology 01 natural sciences Redox Catalysis diffuse reflectance UV-visible lcsh:Chemistry chemistry.chemical_compound lcsh:TP1-1185 organic-inorganic hybrid material Physical and Theoretical Chemistry infrared spectroscopy X-ray absorption spectroscopy 010405 organic chemistry green chemistry Copper-catalysis Diffuse reflectance UV-visible Organic-inorganic hybrid material Silica β-cyclodextrin Copper 0104 chemical sciences chemistry Chemical engineering lcsh:QD1-999 silica Diethylenetriamine copper-catalysis |
| Zdroj: | Catalysts Volume 10 Issue 10 Catalysts, Vol 10, Iss 1118, p 1118 (2020) |
| ISSN: | 2073-4344 |
| DOI: | 10.3390/catal10101118 |
| Popis: | 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 &beta 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 &beta 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. |
| Databáze: | OpenAIRE |
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