Efficient intersystem crossing using singly halogenated carbomethoxyphenyl porphyrins measured using delayed fluorescence, chemical quenching, and singlet oxygen emission

摘要: Sensitizers with high triplet quantum yields are useful for generating photovoltaics, photocatalysts and photodynamic therapy agents increased efficiency. In this study, the heavy atom effect was used to optimize singlet oxygen of 5,10,15,20-tetrakis(4-carbomethoxyphenyl)porphyrin (1-TCM4PP). The yields, determined using delayed fluorescence, calculated as 0.35 1-TCM4PP, 0.75 5,10,15-tris(4-carbomethoxyphenyl)-20-(4-bromophenyl)porphyrin (2-TBCM3PP) 0.88 5,10,15-tris(4-carbomethoxyphenyl)-20-(4-iodophenyl)porphyrin (3-TCM3IPP). Chemical quenching 1,3-diphenylisobenzofuran emission studies rendered an average yield 0.51, 0.75, 0.90 TCM4PP, TBCM3PP TCM3IPP respectively. These photophysical properties indicate that a single halogen is capable transforming TCM4PP into sensitizer strong character. This therapy, creating long lasting reactive species catalysis extending diffusion lengths in photovoltaic applications while retaining three molecular modification points further functionalization.