Synthesis and photophysical properties of modifiable single, dual, and triple-boron dipyrromethene (Bodipy) complexes

In this Letter, three fluorescent compounds based on Bodipy, single-Bodipy, dual-Bodipy, and triple-Bodipy, are described. These compounds exhibit strong absorption bands and high long wavelength emissions. Their photophysical parameters: excitation and quantum yields and HOMO-LUMO, prove that efficient energy transfer occurs between the chromophore groups. The photophysical properties of the Bodipys are investigated in different organic solvents and the compounds exhibit different Stokes' shifts depending on the polarity of solvent. The quantum yields of the compounds change depending on the polarity of the solvent and the binding type of Bodipy unit attached to the benzene ring.