for example, [Ir(ppy)2(dtbbpy)] + was shown to form [Ir(ppy)2(dtb-H3-bpy)] when irradiated with blue LEDs in the presence of DIPEA or triethylamine. In DCM, the absorption spectra of both iridium PCs show considerable changes also in the visible region, particularly the formation of a new band at 412 nm, as well as a band at 314 nm for [Ir(dF(CF3)ppy)2(dtbbpy)]PF6. This suggests that there is significantly more photodegradation in DCM relative to the other solvents, implying that the solvent itself may not be benign under the reaction conditions, which may be why the observed yields lowest in this solvent. Homolysis of the C-Cl bond in DCM can occur photochemically, subsequently decomposing this solvent, although very high energy excitation is typically required to induce this (typically less than 225 nm). It has however been documented that DCM can decompose in the presence of heterogeneous photocatalysts, such as TiO2, with UV irradiation above 300 nm.