scholarly journals New polymeric photosensitizers

2001 ◽  
Vol 73 (3) ◽  
pp. 491-495 ◽  
Author(s):  
Maria Nowakowska ◽  
Mariusz Kepczynski ◽  
Krzysztof Szczubialka
Keyword(s):  
Singlet Oxygen ◽  
Polymer Chain ◽  
Rose Bengal ◽  
Quantum Yields ◽  
Oxygen Production ◽  
Oxygen Formation ◽  
Singlet Oxygen Formation

Novel polymeric photosensitizers for singlet oxygen production in water are described. The polymers contain rose bengal (4,5,6,7-tetrachloro-2',4',5',7'­tetraiodo-fluorescein) chromophores covalently attached to the polymer chain. The quantum yields of singlet oxygen formation and photooxidation of phenol in water have been determined. The methods of separation of photosensitizer from the reactants after completion of reaction have been established.

Quantum yields of singlet oxygen of tetrakis (4-carboxyphenyl) porphyrin in different solvents

2019 ◽  
Vol 23 (10) ◽  
pp. 1084-1091 ◽  
Author(s):  
Shuai Liu ◽  
Yue Hu ◽  
Cun Hu ◽  
Yan Xiong ◽  
Ming Duan
Keyword(s):  
Singlet Oxygen ◽  
Potassium Iodide ◽  
Quantum Yields ◽  
Salting Out ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation ◽  
Oxygen Formation ◽  
Lower Singlet ◽  
Singlet Oxygen Formation ◽  
Formation Efficiency

The singlet oxygen quantum yields of photosensitizers in different solvents are very important for photodynamic therapy (PDT). Here, we investigated the singlet oxygen quantum yields of tetrakis (4-carboxyphenyl) porphyrin (TCPP) in various solvents by the iodide method. Results indicate that TCPP has different singlet oxygen formation efficiency in different solvents. When compared to TCPP dissolved in water, TCPP showed higher singlet oxygen yields in methanol and ethanol, but lower singlet oxygen yields in DMF under identical conditions. In particular, TCPP rapidly precipitated in acetone after potassium iodide added in the solution. The salting out effect of TCPP by potassium iodide in acetone was confirmed by re-dissolving the precipitation in water and the characteristic absorption of TCPP was measured. The phenomenon of salting out for TCPP in acetone suggests that acetone is not a good solvent for singlet oxygen generation when evaluated by the iodide method.

Singlet Oxygen Formation and Scavenging in Cytochromeb6fComplex from Spinach

2012 ◽  
Vol 28 (10) ◽  
pp. 848
Author(s):  
Min SANG ◽  
Xiaochun QIN ◽  
Wenda WANG ◽  
Xiaobo CHEN ◽  
Jie XIE ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Oxygen Formation ◽  
Singlet Oxygen Formation

scholarly journals Synthesis and Physicochemical Properties of [(1R,2S,5R)-2-isopropyl-5-methylcyclohexyloxy]-thiophen-5-yl-substituted Tetrapyrazinoporphyrazine with Magnesium(II) Ion

2021 ◽  
Vol 11 (6) ◽  
pp. 2576
Author(s):  
Sebastian Lijewski ◽  
Jiří Tydlitát ◽  
Beata Czarczynska-Goslinska ◽  
Milan Klikar ◽  
Jadwiga Mielcarek ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Singlet Oxygen ◽  
2D Nmr ◽  
Nmr Studies ◽  
Oxygen Formation ◽  
Nmr Techniques ◽  
Flash Column Chromatography ◽  
Photochemical Stability ◽  
Singlet Oxygen Formation ◽  
Very High

Tetrapyrazinoporphyrazine with peripheral menthol-thiophenyl substituents was synthesized using Linstead conditions and purified by flash column chromatography. The optimized synthetic and purification procedures allowed us to obtain a new macrocycle with 36% yield. Tetrapyrazinoporphyrazine derivative was characterized by UV–Vis and NMR spectroscopy, as well as MS spectrometry. Complex NMR studies using 1D and 2D NMR techniques allowed the analysis of the bulky menthol-thiophenyl substituted periphery of the new macrocycle. Further, photochemical stability and singlet oxygen quantum yield were determined by indirect method with diphenylisobenzofuran. The new tetrapyrazinoporphyrazine revealed low generation of singlet oxygen with a quantum yield of singlet oxygen formation at 2.3% in dimethylformamide. In turn, the macrocycle under irradiation with visible light presented very high stability with quantum yield for photostability of 9.59 × 10−6 in dimethylformamide, which figures significantly exceed the border for its classification as a stable porphyrinoid (10−4–10−5).

scholarly journals Sequence-Specific Cargo Release from DNA Block Copolymers-Lipid Vesicles by Singlet Oxygen Formation

2012 ◽  
Vol 102 (3) ◽  
pp. 290a
Author(s):  
Alberto Rodriguez-Pulido ◽  
Alina I. Kondrachuk ◽  
Deepak K. Prusty ◽  
Andreas Herrmann
Keyword(s):  
Block Copolymers ◽  
Singlet Oxygen ◽  
Lipid Vesicles ◽  
Oxygen Formation ◽  
Singlet Oxygen Formation
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