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Article

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

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Dipartimento di Scienza e Tecnologia del Farmaco, University of Turin, Via Pietro Giuria 9, 10125 Turin, Italy
2
Dipartimento di Chimica, University of Turin, Via Pietro Giuria 7, 10125 Turin, Italy
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Departamento de Física, UPALM, Instituto Politécnico Nacional, ESFM, Zacatenco, Ciudad de México 07738, Mexico
*
Authors to whom correspondence should be addressed.
Catalysts 2020, 10(10), 1118; https://doi.org/10.3390/catal10101118
Received: 26 August 2020 / Revised: 21 September 2020 / Accepted: 23 September 2020 / Published: 27 September 2020
(This article belongs to the Special Issue Functional Organic-Inorganic Interfaces for Enhancing Catalysis)
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. View Full-Text
Keywords: copper-catalysis; silica; β-cyclodextrin; organic-inorganic hybrid material; green chemistry; diffuse reflectance UV-visible; X-ray absorption spectroscopy; infrared spectroscopy copper-catalysis; silica; β-cyclodextrin; organic-inorganic hybrid material; green chemistry; diffuse reflectance UV-visible; X-ray absorption spectroscopy; infrared spectroscopy
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MDPI and ACS Style

Calsolaro, F.; Martina, K.; Borfecchia, E.; Chávez-Rivas, F.; Cravotto, G.; Berlier, G. β-Cyclodextrin-Silica Hybrid: A Spatially Controllable Anchoring Strategy for Cu(II)/Cu(I) Complex Immobilization. Catalysts 2020, 10, 1118. https://doi.org/10.3390/catal10101118

AMA Style

Calsolaro F, Martina K, Borfecchia E, Chávez-Rivas F, Cravotto G, Berlier G. β-Cyclodextrin-Silica Hybrid: A Spatially Controllable Anchoring Strategy for Cu(II)/Cu(I) Complex Immobilization. Catalysts. 2020; 10(10):1118. https://doi.org/10.3390/catal10101118

Chicago/Turabian Style

Calsolaro, Federica, Katia Martina, Elisa Borfecchia, Fernando Chávez-Rivas, Giancarlo Cravotto, and Gloria Berlier. 2020. "β-Cyclodextrin-Silica Hybrid: A Spatially Controllable Anchoring Strategy for Cu(II)/Cu(I) Complex Immobilization" Catalysts 10, no. 10: 1118. https://doi.org/10.3390/catal10101118

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