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 β–β′-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°, 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.