Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 189, Issue -, Pages 13-21Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2017.08.005
Keywords
Photosensitizer; BODIPY; Singlet oxygen; Triplet state; Photoinduced electron transfer
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Funding
- Hebei Provincial Hundred Talents Plan [E2013100005]
- Hebei Provincial Natural Science Foundation [B2014407080]
- HBUST [CXTD2012-05]
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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. (C) 2017 Elsevier B.V. All rights reserved.
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