Summary of synthetic steps for the preparation of the TiO2/PMAA nanoparticle SABRE catalysts (NPCs). The ratio of amino-pyridine/catalyst moieties to polymer strands is expected to be ~1:1; the final structure is depicted with one possible configuration, with the catalyst moiety bound to a terminal amino-pyridine group; amino-pyridine/catalyst moieties may also functionalize repeat units. Bare TiO2 NPs, NPs coated/infused with PMAA, and final functionalized NPCs are shown in grey, light blue, and orange/red, respectively. Components are not drawn to scale.