The transfer hydrogenation of cinnamaldehyde using homogeneous Cobalt(II) and Nickel(II) (E)-1-(Pyridin-2-yl)-N-(3-(triethoxysilyl)propyl)methanimine and the complexes anchored on Fe 3 O 4 support as pre-catalysts: an experimental and in silico approach

Sejie, Fortunate P., Oyetunji, Olayinka A., Darkwa, James, Beas, Isaac N., Makhubela, Banothile C. E., Dzade, Nelson Y. ORCID: https://orcid.org/0000-0001-7733-9473 and de Leeuw, Nora H. ORCID: https://orcid.org/0000-0002-8271-0545 2023. The transfer hydrogenation of cinnamaldehyde using homogeneous Cobalt(II) and Nickel(II) (E)-1-(Pyridin-2-yl)-N-(3-(triethoxysilyl)propyl)methanimine and the complexes anchored on Fe 3 O 4 support as pre-catalysts: an experimental and in silico approach. Molecules 28 (2) , 659. 10.3390/molecules28020659

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Abstract

The imino pyridine Schiff base cobalt(II) and nickel(II) complexes (C1 and C2) and their functionalised γ-Fe3O4 counterparts (Fe3O4@C1 and Fe3O4@C2) were synthesised and characterised using IR, elemental analysis, and ESI-MS for C1 and C2, and single crystal X-ray diffraction for C1, while the functionalised materials Fe3O4@C1 and Fe3O4@C2 were characterized using IR, XRD, SEM, TEM, EDS, ICP-OES, XPS and TGA. Complexes C1, C2 and the functionalised materials Fe3O4@C1 and Fe3O4@C2 were tested as catalysts for the selective transfer hydrogenation of cinnamaldehyde and all four pre-catalysts showed excellent catalytic activity. Complexes C1 and C2 acted as homogeneous catalysts with high selectivity towards the formation of hydrocinnamaldehyde (88.7% and 92.6%, respectively) while Fe3O4@C1 and Fe3O4@C2 acted as heterogeneous catalysts with high selectivity towards cinnamyl alcohol (89.7% and 87.7%, respectively). Through in silico studies of the adsorption energies, we were able to account for the different products formed using the homogeneous and the heterogeneous catalysts which we attribute to the preferred interaction of the C=C moiety in the substrate with the Ni centre in C2 (−0.79 eV) rather than the C=O (−0.58 eV).

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	?? VCO ?? Chemistry
Additional Information:	License information from Publisher: LICENSE 1: URL: https://creativecommons.org/licenses/by/4.0/, Type: open-access
Publisher:	MDPI
Date of First Compliant Deposit:	6 February 2023
Date of Acceptance:	28 December 2022
Last Modified:	19 May 2023 02:44
URI:	https://orca.cardiff.ac.uk/id/eprint/156512

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