β-Cyclodextrin-Silica Hybrid: A Spatially Controllable Anchoring Strategy for Cu(II)/Cu(I) Complex Immobilization
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 C...
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doaj-3948e4658e4a4445b80ce672d5f98b4c2020-11-25T03:31:02ZengMDPI AGCatalysts2073-43442020-09-01101118111810.3390/catal10101118β-Cyclodextrin-Silica Hybrid: A Spatially Controllable Anchoring Strategy for Cu(II)/Cu(I) Complex ImmobilizationFederica Calsolaro0Katia Martina1Elisa Borfecchia2Fernando Chávez-Rivas3Giancarlo Cravotto4Gloria Berlier5Dipartimento di Scienza e Tecnologia del Farmaco, University of Turin, Via Pietro Giuria 9, 10125 Turin, ItalyDipartimento di Scienza e Tecnologia del Farmaco, University of Turin, Via Pietro Giuria 9, 10125 Turin, ItalyDipartimento di Chimica, University of Turin, Via Pietro Giuria 7, 10125 Turin, ItalyDipartimento di Chimica, University of Turin, Via Pietro Giuria 7, 10125 Turin, ItalyDipartimento di Scienza e Tecnologia del Farmaco, University of Turin, Via Pietro Giuria 9, 10125 Turin, ItalyDipartimento di Chimica, University of Turin, Via Pietro Giuria 7, 10125 Turin, ItalyThe 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.https://www.mdpi.com/2073-4344/10/10/1118copper-catalysissilicaβ-cyclodextrinorganic-inorganic hybrid materialgreen chemistrydiffuse reflectance UV-visible |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Federica Calsolaro Katia Martina Elisa Borfecchia Fernando Chávez-Rivas Giancarlo Cravotto Gloria Berlier |
spellingShingle |
Federica Calsolaro Katia Martina Elisa Borfecchia Fernando Chávez-Rivas Giancarlo Cravotto Gloria Berlier β-Cyclodextrin-Silica Hybrid: A Spatially Controllable Anchoring Strategy for Cu(II)/Cu(I) Complex Immobilization Catalysts copper-catalysis silica β-cyclodextrin organic-inorganic hybrid material green chemistry diffuse reflectance UV-visible |
author_facet |
Federica Calsolaro Katia Martina Elisa Borfecchia Fernando Chávez-Rivas Giancarlo Cravotto Gloria Berlier |
author_sort |
Federica Calsolaro |
title |
β-Cyclodextrin-Silica Hybrid: A Spatially Controllable Anchoring Strategy for Cu(II)/Cu(I) Complex Immobilization |
title_short |
β-Cyclodextrin-Silica Hybrid: A Spatially Controllable Anchoring Strategy for Cu(II)/Cu(I) Complex Immobilization |
title_full |
β-Cyclodextrin-Silica Hybrid: A Spatially Controllable Anchoring Strategy for Cu(II)/Cu(I) Complex Immobilization |
title_fullStr |
β-Cyclodextrin-Silica Hybrid: A Spatially Controllable Anchoring Strategy for Cu(II)/Cu(I) Complex Immobilization |
title_full_unstemmed |
β-Cyclodextrin-Silica Hybrid: A Spatially Controllable Anchoring Strategy for Cu(II)/Cu(I) Complex Immobilization |
title_sort |
β-cyclodextrin-silica hybrid: a spatially controllable anchoring strategy for cu(ii)/cu(i) complex immobilization |
publisher |
MDPI AG |
series |
Catalysts |
issn |
2073-4344 |
publishDate |
2020-09-01 |
description |
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. |
topic |
copper-catalysis silica β-cyclodextrin organic-inorganic hybrid material green chemistry diffuse reflectance UV-visible |
url |
https://www.mdpi.com/2073-4344/10/10/1118 |
work_keys_str_mv |
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