Organic nanostructures of thermally activated delayed fluorescent emitters with enhanced intersystem crossing as novel metal-free photosensitizers

2016 ◽  
Vol 52 (79) ◽  
pp. 11744-11747 ◽  
Author(s):  
Jinfeng Zhang ◽  
Wencheng Chen ◽  
Rui Chen ◽  
Xiao-Ke Liu ◽  
Yuan Xiong ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Intersystem Crossing ◽  
Oxygen Generation ◽  
Metal Free ◽  
Thermally Activated ◽  
Singlet Oxygen Generation ◽  
Organic Nanostructures

We applied organic nanostructures based on TADF emitters for singlet oxygen generation.

Achieving high singlet-oxygen generation by applying the heavy-atom effect to thermally activated delayed fluorescent materials

2021 ◽  
Author(s):  
Ya-Fang Xiao ◽  
Jia-Xiong Chen ◽  
Wen-Cheng Chen ◽  
Xiuli Zheng ◽  
Chen Cao ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Heavy Atom ◽  
Synergetic Effect ◽  
Heavy Atom Effect ◽  
Oxygen Generation ◽  
Thermally Activated ◽  
Singlet Oxygen Generation ◽  
Fluorescent Materials ◽  
Atom Effect

Applying the heavy-atom effect to TADF photosensitizers achieves ultra-high 1O2 generation (ФΔ = 0.91) by the synergetic effect of small ΔEST and considerable SOC.

Aggregation-induced emission (AIE)-active molecules bearing singlet oxygen generation activities: the tunable singlet–triplet energy gap matters

2019 ◽  
Vol 55 (10) ◽  
pp. 1450-1453 ◽  
Author(s):  
Chengkai Zhang ◽  
Yanqian Zhao ◽  
Dandan Li ◽  
Jiejie Liu ◽  
Heguo Han ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Cell Apoptosis ◽  
Near Infrared ◽  
Energy Gap ◽  
Intersystem Crossing ◽  
Triplet Energy ◽  
Oxygen Generation ◽  
Two Photon ◽  
Singlet Oxygen Generation ◽  
Infrared Excitation

Two-photon active photosensitizers showed relatively strong intersystem crossing facilitating 1O2 generation and cell apoptosis with near-infrared excitation.

scholarly journals Novel Hexadeca-Substituted Metal Free and Zinc(II) Phthalocyanines; Design, Synthesis and Photophysicochemical Properties

Molecules ◽  
2018 ◽  
Vol 24 (1) ◽  
pp. 77 ◽  
Author(s):  
Ayoub Awaji ◽  
Baybars Köksoy ◽  
Mahmut Durmuş ◽  
Ateyatallah Aljuhani ◽  
Shaya Alraqa
Keyword(s):  
Photodynamic Therapy ◽  
Singlet Oxygen ◽  
13C Nmr ◽  
Design Synthesis ◽  
Oxygen Generation ◽  
Metal Free ◽  
Singlet Oxygen Generation ◽  
Ft Ir ◽  
Photochemical Properties ◽  
Phthalocyanine Derivative

The syntheses of a novel 1,4,8,11,15,18,22,25-octahexyloxy-2,3,9,10,16,17,23,24-octa-(4-trifluoromethoxyphenyl) phthalocyanine (3a) and its zinc(II) phthalocyanine derivative (3b) have been described and characterized by elemental analysis,1H NMR, 13C NMR, 19F NMR, mass, UV-Vis and FT-IR. The newly prepared metal-free phthalocyanine and its zinc(II) counterpart are soluble in most organic solvents. The photophysical and photochemical properties such as aggregation, fluorescence, singlet oxygen generation and photodegradation under light irradiation of these phthalocyanines have been investigated in DMF. The hexadeca-substituted phthalocyanines (3a and 3b) showed longer absorption and emission wavelength values when compared to that of reported phthalocyanine derivatives due to substitution of the all possible positions in the phthalocyanine framework. The zinc(II) phthalocyanine derivative does not only have a good singlet oxygen generation but also has other photophysicochemical properties that enables this phthalocyanine to be useful as a photosensitizer for cancer treatment using photodynamic therapy.

Symmetrical phthalocyanine bearing four triptycene moieties: Synthesis, photophysical and singlet oxygen generation

2019 ◽  
Vol 23 (09) ◽  
pp. 990-1000 ◽  
Author(s):  
Shaya Y. Al-Raqa ◽  
Bader S. Ghanem ◽  
Esra Nur Kaya ◽  
Mahmut Durmuş ◽  
Mohamed E. El-Khouly
Keyword(s):  
Singlet Oxygen ◽  
Chemical Method ◽  
Visible Region ◽  
Quantum Yields ◽  
Nanosecond Laser ◽  
Fluorescence Lifetimes ◽  
Absorption Bands ◽  
Oxygen Generation ◽  
Metal Free ◽  
Singlet Oxygen Generation

Novel metal-free (7) and zinc(II) (8) phthalocyanine derivatives bearing four substituted triptycene moieties were synthesized and fully characterized by various spectroscopic methods including 1H-NMR, 13C-NMR, mass, FT-IR and UV-vis. Photophysical and photochemical properties such as electronic absorption, fluorescence emission, fluorescence lifetimes and singlet oxygen generation were investigated in toluene. The UV-vis spectra of 7 and 8 exhibited absorption bands in the visible region. The fluorescence lifetimes of 7 and 8 phthalocyanines were found to be 6.2 and 3.6 ns, respectively. The ability of the examined zinc(II) (8) and metal-free (7) to produce the singlet oxygen has been determined by both chemical and direct methods. While the chemical method 1,3-diphenylisobenzofuran (DPBF) as a singlet oxygen quencher was used in the first method, the direct determination has been done by recording the weak emission band of the singlet oxygen in the near-infrared region (1270 nm). From the direct process, the quantum yields of the singlet oxygen were found to be 0.28 (for 7) and 0.60 (for 8) and similar values were also obtained by the chemical method. The fluorescence quenching behavior of the studied phthalocyanine compounds (8 and 7) by electron-accepting 1,4 benzoquinone (BQ) was also studied in toluene. The powerful nanosecond laser flash photolysis technique was also employed to record the transient absorption spectra of the long-lived triplet states of the investigated compounds.

pH Controlled Intersystem Crossing and Singlet Oxygen Generation of 8-Azaadenine in Aqueous Solution

ChemPhysChem ◽  
2019 ◽  
Vol 20 (5) ◽  
pp. 757-765 ◽  
Author(s):  
Zhongneng Zhou ◽  
Zhubin Hu ◽  
Xianwang Zhang ◽  
Menghui Jia ◽  
Xueli Wang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Singlet Oxygen ◽  
Intersystem Crossing ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation ◽  
Ph Controlled

scholarly journals Heavy-atom-free BODIPY photosensitizers with intersystem crossing mediated by intramolecular photoinduced electron transfer

2020 ◽  
Vol 18 (1) ◽  
pp. 10-27 ◽  
Author(s):  
Mikhail A. Filatov
Keyword(s):  
Electron Transfer ◽  
Charge Transfer ◽  
Triplet State ◽  
Singlet Oxygen ◽  
Photoinduced Electron Transfer ◽  
Heavy Atom ◽  
Intersystem Crossing ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation ◽  
Donor Acceptor

This review discusses photoinduced electron transfer, triplet state formation from charge transfer states and singlet oxygen generation by heavy-atom-free BODIPY donor–acceptor dyads and dimers.

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