Fully Functionalizable β,β′-BODIPY Dimer: Synthesis, Structure, and Photophysical Signatures

The versatility in the synthesis of BODIPY derivatives in terms of functionalization is further demonstrated. In particular, in this work beta-beta'-BODIPY dimers with varied functional groups in the meso positions were synthesized in very efficient yields and short reaction times from a single platform. A photophysical study was carried out in all of the compounds. The resultant dimers show absorption bands at around 600 nm as a consequence of electronically coupled monomers disposed with a dihedral angle of around 30 degrees, which is supported by theoretical simulations. The emission properties of these molecules are distinguished by the appearance of an ICT state as the polarity of the solvent increases.