Figure 1.

Photocatalytic proximity labeling with localized organic dyes and aryl azide probes inside live mammalian cells. (a) Representative transition-metal photocatalysts based on heavy metals ruthenium and iridium and organic photocatalysts acridine orange (AO), fluorescein (Fluo), and rhodamine 123 (Rh 123). (b) Stable aryl azide probes were activated to the reactive probes only in the proximity of the localized organic dyes for spatial protein labeling reactions under visible light irradiation.