Figure 1.

UV-Vis absorption spectra of aqueous solutions containing (a) ${\mathrm{Au}}^{\mathrm{III}}{\mathrm{Cl}}_4^{-}$ (5 × 10⁻⁴ mol.L⁻¹) and ${\mathrm{Pt}}^{\mathrm{II}}{\left({\mathrm{NH}}_3\right)}_4^{2+}$ (5 × 10⁻⁴ mol.L⁻¹) separately, mixed together, or mixed with PEG-2NH₂, (b) ${\mathrm{Au}}^{\mathrm{III}}{\mathrm{Cl}}_4^{-}$ (10⁻³ mol.L⁻¹) mixed with PEG-2NH₂ before and after irradiation at different doses, and (c) ${\mathrm{Au}}^{\mathrm{III}}{\mathrm{Cl}}_4^{-}$ (5 × 10⁻⁴ mol.L⁻¹), ${\mathrm{Pt}}^{\mathrm{II}}{\left({\mathrm{NH}}_3\right)}_4^{2+}$ (5 × 10⁻⁴ mol.L⁻¹) mixed with PEG-2NH₂, before and after irradiation at different doses. Inserts: images of solutions resulting from 0.5, 1.0, and 2.5 kGy irradiation doses. PEG, polyethylene glycol.