Abstract
The oxidation of ethylene catalyzed by manganese and technetium oxo complexes of the type MO3L (M = Tc, Mn, and L = O−, Cl−, F−, OH−, Br−, I−) on both singlet and triplet potential energy surfaces (PESs) have been studied. All molecular structures were stable on the singlet PES except for the formation of the dioxylate intermediate for the MnO3L (L = O−, Cl−, F−, OH−, Br−, I−) catalyzed pathway. Frontier molecular orbital calculations showed that electrons flow from the HOMO of ethylene into the LUMO of the metal-oxo complex for all complexes studied except for MO3L (M = Tc, Mn, and L = O−) where the vice versa occurs. In the reaction of both TcO3L and MnO3L (L = O−, Cl−, F−, OH−, Br−, I−) with ethylene, it was observed that the formation of the dioxylate intermediate along the [3 + 2] addition pathway on the singlet reaction surface is both kinetically and thermodynamically favorable over its formation via the [2 + 2] pathway. Furthermore, it was observed that TcO4− and MnO4− catalyzed pathways exclusively form diols on the singlet PES. The formation of epoxides on the singlet surface is kinetically favorable through the [2 + 1] and [2 + 2] channel for the MnO3L (L = F−, Cl−, Br−, I−, OH−) and TcO3L (L = F−, Cl−, Br−, I−, OH−) catalyzed surfaces respectively. In all cases, the TcO3L complexes were found to be polar compared to the MnO3L complexes. The MnO4− (singlet) and MnO3F (singlet) are the best catalysts for the exclusive formation of the diols and epoxides respectively.
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We acknowledge the University of Johannesburg for using the Spartan cluster and the Centre for High-Performance Computing (CHPC-South Africa) for using the cluster.
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Fosu, E.A., Obuah, C., Hamenu, L. et al. A DFT study on the reaction mechanisms of the oxidation of ethylene mediated by technetium and manganese oxo complexes. J Mol Model 28, 94 (2022). https://doi.org/10.1007/s00894-022-05092-0
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DOI: https://doi.org/10.1007/s00894-022-05092-0