2.2.4. Nanoparticle Surface Complexation (Ru@SrTiO3, Ru@BaTiO3)

The metal complex was formed directly on the NP surface. 1@SrTiO₃ (70.9 mg), RuCl₃^.3H₂O (1.03 mg, 3.94 µmol), and bpy (1.25 mg, 8.00 µmol) were added to a vial. H₂O (5.0 mL) and EtOH (3.0 mL) were added, and the mixture was thoroughly dispersed using sonication and stirring. The suspension was transferred into an autoclave PTFE liner with additional EtOH (2.0 mL). The autoclave was sealed and then heated in an oven at a heating rate of 320 °C/h to 160 °C. The autoclave was left at 160 °C for 1 h. After cooling, the autoclave was opened, and the suspension was centrifuged (20 min, 7000 rpm). The resulting NPs were washed with H₂O (3 × 10 mL) and EtOH (1 × 10 mL). Ru@SrTiO₃ (65.8 mg) was obtained as a pale orange powder after drying the NPs under a high vacuum. This experiment was repeated with 1@BaTiO₃ (70.9 mg), RuCl₃^.3H₂O (1.03 mg, 3.95 µmol), and bpy (1.25 mg, 8.00 µmol) yielding Ru@BaTiO₃ (67.0 mg) as a dark brown powder. The characterization data are given in the Supplementary Materials. The TGA, TGA-MS, and MALDI spectra are given in the Supplementary Materials (Figures S29–S34).