Time-Resolved Determination of the Quantum Yield of Singlet Oxygen Formation by Tetraphenylporphine under Conditions of Very Strong Quenching†

2000 ◽  
Vol 104 (14) ◽  
pp. 3177-3180 ◽  
Author(s):  
Reinhard Schmidt ◽  
Charles Tanielian
Keyword(s):  
Quantum Yield ◽  
Singlet Oxygen ◽  
Time Resolved ◽  
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).

Time-resolved luminescence and singlet oxygen formation under illumination of hypericin in acetone

2008 ◽  
Vol 128 (5-6) ◽  
pp. 765-767 ◽  
Author(s):  
P. Gbur ◽  
R. De˘dic ◽  
D. Jancura ◽  
P. Miškovský ◽  
J. Hála
Keyword(s):  
Singlet Oxygen ◽  
Time Resolved ◽  
Oxygen Formation ◽  
Singlet Oxygen Formation

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
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