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Reaction parameters for the preparation of colloidal nanoparticles (NPs) were optimized to yield small (2\u20132.5\u2005nm) and well\u2010dispersed NPs. Manganese NPs were further immobilized on an imidazolium\u2010based 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<jats:sub><jats:italic>x<\/jats:italic><\/jats:sub>@SILP material showed promising performance in the CTH of aldehydes and ketones using 2\u2010propanol as a hydrogen donor, outperforming previously reported Mn NPs\u2010based CTH catalysts in terms of metal loading\u2010normalized turnover numbers. 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