Synthesis, structure, spectral and redox properties of 3-pyrrolyl BODIPYs containing one to eight bromides at the pyrrole carbons

and the number of bromide groups at the pyrrole carbons of 3-pyrrolyl BODIPY and (iv) the halogenated 3-pyrrolyl BODIPYs were highly efficient in generating singlet oxygen. A linear relationship was observed between the singlet oxygen quantum yields and the number of bromides at the pyrrole carbons of 3-pyrrolyl BODIPY. Furthermore, DFT and TD-DFT studies supported these experimental observations.