Nucleophilic Aromatic Substitution (S N Ar) as an Approach to Challenging Nitrogen-Bridged BODIPY Oligomers.

A series of nitrogen-bridged BODIPY oligomers were synthesized via nucleophilic aromatic substitution (SN Ar) as a convenient approach. Further transformations achieved novel α,α-aryl BODIPY dimers as well as a BODIPY hexamer efficiently. These BODIPY oligomers showed good photophysical properties, such as apparent absorption and emission both in visible and near-infrared regions. Interestingly, the high air and photothermal stability, strong NIR absorption, and high photothermal conversion rates of hexamer B6 suggest potential applications in photothermal therapy.