Figure 2.

Example of a photosubstitution reaction used in PACT with ruthenium photocage [Ru(tpy)(bpy)(Hmte)]²⁺. The blue peak in the UV–vis spectrum shows the emission of the light source used to trigger photosubstitution, centered at 450 nm. The bottom graph shows the time evolution of the absorption spectrum of the solution during light irradiation. The low α angle (∼160°) in the terpyridine ligand distorts the first coordination sphere of the metal center compared to a perfect octahedron (180°), which facilitates photosubstitution. Data adapted from ref (17).