Attaching naphthalene derivatives onto BODIPY for generating excited triplet state and singlet oxygen: Tuning PET-based photosensitizer by electron donors

作者：Zhang, Xian-Fu^*; Feng, Nan

来源：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , 2018, 189: 13-21.

DOI：10.1016/j.saa.2017.08.005

• Photosensitizer
• BODIPY
• Singlet oxygen
• Triplet state
• Photoinduced electron transfer

meso-Naphthalene substituted BODIPY compounds were prepared in a facile one pot reaction. The naphthalene functionalization of BODIPY leads up to a 5-fold increase in the formation efficiency of excited triplet state and singlet oxygen in polar solvents. Steady state and time resolved fluorescence, laser flash photolysis, and quantum chemistry methods were used to reveal the mechanism. All measured data and quantum chemical results suggest that these systems can be viewed as electron donor-acceptor (D-A) pair (BODIPY acts as the acceptor), photoinduced charge transfer (PCT) or photoinduced electron transfer (PET) occurs upon photo excitation (D-A + hv -> D delta+-A(delta-), 0 < delta <= 1), and the charge recombination induced the formation of triplet state (D delta+-A(delta-) -> D-A (T-1). These novel PCT- or PET-based photosensitizers (PSs) show different features from traditional PSs, such as the strong tunability by facile structural modification and good selectivity upon medium polarity. The new character for this type of PSs can lead to important applications in organic oxygenation reactions and photodynamic therapy of tumors.

• 出版日期2018-1-15
• 单位河北科技师范学院