AI Article Synopsis
- Researchers synthesized colloidal and supported manganese nanoparticles (NPs) using an organometallic method for catalytic transfer hydrogenation (CTH) of aldehydes and ketones.
- They optimized the synthesis process to create small (2-2.5 nm) and well-dispersed NPs, then immobilized them on a supported ionic phase for analysis of their properties.
- The final MnO@SILP material demonstrated excellent CTH performance with 2-propanol but lost effectiveness when exposed to air, linked to increased oxidation states of manganese.
Article Abstract
Colloidal and supported manganese nanoparticles were synthesized following an organometallic approach and applied in the catalytic transfer hydrogenation (CTH) of aldehydes and ketones. Reaction parameters for the preparation of colloidal nanoparticles (NPs) were optimized to yield small (2-2.5 nm) and well-dispersed NPs. Manganese NPs were further immobilized on an imidazolium-based supported ionic phase (SILP) and characterized to evaluate NP size, metal loading, and oxidation states. Oxidation of the Mn NPs by the support was observed resulting in an average formal oxidation state of +2.5. The MnO@SILP material showed promising performance in the CTH of aldehydes and ketones using 2-propanol as a hydrogen donor, outperforming previously reported Mn NPs-based CTH catalysts in terms of metal loading-normalized turnover numbers. Interestingly, MnO@SILP were found to lose activity upon air exposure, which correlates with an additional increase in the average oxidation state of Mn as revealed by X-ray absorption spectroscopic studies.
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| http://dx.doi.org/10.1002/chem.202304228 | DOI Listing |
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