Oxidovanadium(V) complexes with tridentate hydrazone ligands as oxygen atom transfer catalysts
Hossain, M. K., Haukka, M., Lisensky, G. C., Richmond, M. G., & Nordlander, E. (2024). Oxidovanadium(V) complexes with tridentate hydrazone ligands as oxygen atom transfer catalysts. Polyhedron, 258, Article 117020. https://doi.org/10.1016/j.poly.2024.117020
Julkaistu sarjassa
PolyhedronTekijät
Päivämäärä
2024Tekijänoikeudet
© 2024 The Authors. Published by Elsevier Ltd.
Four isostructural oxovanadium(V) complexes with hydrazone ligands have been synthesised, characterised, and evaluated as epoxidation and sulfoxidation catalysts. The reactions between [VO(acac)2] (acac– = acetylacetonate) and H2Ln (n = 1–4), precursors for monoanionic tridentate hydrazone ligands, afford complexes formulated as [VO(Ln)(bzh)·MeOH] (1–4) when bidentate benzohydroxamic acid (Hbzh) is included as a co-ligand. Single crystal X-ray structure analyses showed that complexes 1–3 have a distorted octahedral coordination geometry with an O5N coordination environment. Cyclic voltammetry showed that all complexes undergo two quasi-irreversible reduction peaks and a single irreversible oxidation peak. The bonding in 1 has been investigated by electronic structure calculations, and these data are discussed with respect to the electrochemical results. Complexes 1–4 were tested as catalysts for the epoxidation of cis-cyclooctene at 50 °C and sulfoxidation of methyl-p-tolylsulfide at room temperature using tert-butyl hydroperoxide (tBuOOH) and aqueous H2O2 as the terminal oxidants.
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0277-5387Asiasanat
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https://converis.jyu.fi/converis/portal/detail/Publication/213532202
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This research was supported by COST Action CM1003 Biological oxidation reactions -mechanisms and design of new catalysts. MGR thanks the Robert A. Welch Foundation (Grant B-1093) for funding. The DFT calculations were performed at the University of North Texas through CASCaM, which is an NSF-supported facility (CHE-1531468). M.K.H. gratefully acknowledge the European Commission for an Erasmus Mundus predoctoral fellowship. M.K.H also gratefully acknowledges the financial support from the Ministry of Science and Technology (Bangladesh) for part of the work. ...Lisenssi
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