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β-cyclodextrin-silica hybrid: a spatially controllable anchoring strategy for Cu(II)/Cu(I) complex immobilization

DOI: 10.3390/catal10101118 DOI Help

Authors: Federica Calsolaro (University of Turin) , Katia Martina (University of Turin) , Elisa Borfecchia (University of Turin) , Fernando Chávez-Rivas (University of Turin; UPALM, Instituto Politécnico Nacional) , Giancarlo Cravotto (University of Turin) , Gloria Berlier (University of Turin)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Catalysts , VOL 10

State: Published (Approved)
Published: October 2020
Diamond Proposal Number(s): 21713

Open Access Open Access

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.

Journal Keywords: copper-catalysis; silica; β-cyclodextrin; organic-inorganic hybrid material; green chemistry; diffuse reflectance UV-visible; X-ray absorption spectroscopy; infrared spectroscopy

Subject Areas: Chemistry

Instruments: B18-Core EXAFS

Added On: 08/10/2020 09:37


Discipline Tags:

Physical Chemistry Catalysis Chemistry Inorganic Chemistry Organic Chemistry

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS)