Abstract
Green, red and far-red emitting Borondipyrromethene (BODIPY) derivatives with 3-ethynylthiophene units at various positions around the BODIPY core were synthesized and their photophysical properties were studied. 3-Ethynylthiophene substitution at the 2,6 positions caused significant increase in Stokes shift while substitution at the 8 and 4,4’ positions had no effect. Photooxidation of 1,3-diphenylisobenzofuran (DPBF) in the presence of 3-ethynylthiophene substituted BODIPY derivatives confirmed singlet oxygen generation. 3-Ethynylthiophene substitution at the 2,6 positions is more effective in singlet oxygen generation compared to 4’4 substitutions. Substitution through phenyl group at the meso (8) position gave the lowest rate for singlet oxygen production. All 3-ethynylthiophene containing BODIPY derivatives were highly photo-stable under our experimental conditions.
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