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Dioxo-molybdenum(VI) unsymmetrical Schiff base complex supported on CoFe2O4@SiO2 nanoparticles as a new magnetically recoverable nanocatalyst for selective epoxidation of alkenes

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Abstract

In the present work, a dioxo-molybdenum unsymmetrical Schiff base complex, [MoO2(salenac-OH)], in which salenac-OH = [9-(2',4'-dihydroxyphenyl)-5,8-diaza-4-methylnona-2,4,8-trienato](-2), has been prepared and covalently immobilized on the silica-coated CoFe2O4 magnetic nanoparticles (CoFe2O4@SiO2 MNPs) surface as support. Different methods including scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, vibrating sample magnetometry (VSM), X-ray diffraction (XRD), energy-dispersive X-ray (EDX), inductively coupled plasma (ICP), thermal gravimetric analysis (TGA), and elemental analysis have been used to characterize the prepared CoFe2O4@SiO2@[MoO2(salenac-OH)] nanocatalyst. The catalytic activity of this novel heterogeneous catalyst has been investigated in the selective epoxidation of alkenes using tert-butyl hydroperoxide (TBHP, 70% aqueous solution) as the oxidizing agent, and the corresponding products were achieved in good to excellent yields in 1,2-dichloroethane at 50 °C. Using an external magnet, this magnetic nanocatalyst can be simply separated from the reaction mixture and reused for five cycles without a remarkable decrease in catalytic activity. In addition, no significant changes were found in the recovered catalyst’s FT-IR spectrum compared with the fresh one.

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Acknowledgements

We gratefully acknowledge the Vali-e-Asr University of Rafsanjan for the support for this work. The corresponding author also appreciates the valuable helps provided by Professor Majid Moghadam from University of Isfahan, Dr. Reza Kia from Sharif University of Technology, and Dr. Esmaeil Heydari-Bafrooei from Isfahan University of Technology (IUT).

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Vali-E-Asr University of Rafsanjan, 77188-97111, Rafsanjan, Iran

    Mahnaz Samani, Mehdi Hatefi Ardakani & Mohammad Sabet

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  1. Mahnaz Samani
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  2. Mehdi Hatefi Ardakani
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  3. Mohammad Sabet
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Correspondence to Mehdi Hatefi Ardakani.

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Samani, M., Ardakani, M.H. & Sabet, M. Dioxo-molybdenum(VI) unsymmetrical Schiff base complex supported on CoFe2O4@SiO2 nanoparticles as a new magnetically recoverable nanocatalyst for selective epoxidation of alkenes. J IRAN CHEM SOC 19, 3491–3499 (2022). https://doi.org/10.1007/s13738-022-02546-3

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