Figure 1.

Structure (inset) and aliphatic section of the ¹H NMR spectra of RuBi-Dopa in D₂O before (top trace) and after (bottom trace) irradiation into the NMR tube with a 525 nm green LED. The doublets below 1.2 ppm belong to coordinated trimethylphosphine (PMe₃) in RuBi-Dopa (top trace) and in the aquo-complex formed after photoreaction (bottom trace). Signals of coordinated dopamine (B and C) are also apparent. The triplets A₁ and A₂, corresponding to the coordinated −NH₂, disappear after irradiation due to rapid exchange with D₂O. The signals of the free dopamine methylenes (B′ and C′) are indicative of the successful photorelease of the ligand.