scholarly journals A novel characteristic of salicylate UV absorbers: suppression of diethylhexyl 2,6-naphthalate (Corapan TQ)-photosensitized singlet oxygen generation

2019 ◽  
Vol 18 (6) ◽  
pp. 1556-1564 ◽  
Author(s):  
Shirabe Fukuchi ◽  
Mikio Yagi ◽  
Nozomi Oguchi-Fujiyama ◽  
Jasmin Kang ◽  
Azusa Kikuchi
Keyword(s):  
Quantum Yield ◽  
Singlet Oxygen ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation ◽  
Uv Absorbers

40% of the quantum yield of DEHN-photosensitized singlet oxygen generation is decreased by adding 32 mmol dm−3 EHS.

Rigid axially symmetrical C60-BODIPY triplet photosensitizers: effect of bridge length on singlet oxygen generation

2020 ◽  
Vol 44 (46) ◽  
pp. 20419-20427
Author(s):  
San-E Zhu ◽  
Jianhui Zhang ◽  
Lifeng Dou ◽  
Na Li ◽  
Kunhong Hu ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Singlet Oxygen ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation ◽  
Bridge Length

Two rigid axially symmetrical C60-BODIPY systems with different bridge lengths have been synthesized and the dyad with short bridge generates a higher quantum yield of singlet oxygen.

scholarly journals Concentration Increase of the Singlet-Oxygen Generation Quantum Yield by an Indotricarbocyanine Dye

2014 ◽  
Vol 81 (2) ◽  
pp. 214-221 ◽  
Author(s):  
M. P. Samtsov ◽  
D. S. Tarasau ◽  
A. S. Stasheuski ◽  
K. N. Kaplevsky ◽  
E. S. Voropay
Keyword(s):  
Quantum Yield ◽  
Singlet Oxygen ◽  
Concentration Increase ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation

scholarly journals Modulation of singlet oxygen generation in halogenated BODIPY dyes by substitution at their meso position: towards a solvent-independent standard in the vis region

RSC Advances ◽  
2016 ◽  
Vol 6 (48) ◽  
pp. 41991-41998 ◽  
Author(s):  
Nerea Epelde-Elezcano ◽  
Virginia Martínez-Martínez ◽  
Eduardo Peña-Cabrera ◽  
César F. A. Gómez-Durán ◽  
Iñigo López Arbeloa ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Singlet Oxygen ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation ◽  
Meso Position ◽  
Suitable Reference

Halogenated BODIPY with different substitutions patterns at their meso position are deeply analyzed. One of them is proposed as a suitable reference with high singlet oxygen quantum yield, practically solvent-independent in a broad polarity range.

scholarly journals Temperature dependence of singlet oxygen generation by different photosensitizers

2019 ◽  
Vol 220 ◽  
pp. 01012
Author(s):  
Aleksander Starukhin ◽  
Aleksander Gorski ◽  
Jacek Dobkowski
Keyword(s):  
Quantum Yield ◽  
Ambient Temperature ◽  
Singlet Oxygen ◽  
Temperature Dependence ◽  
Molecular Oxygen ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation ◽  
Temperature Dependences

The temperature dependences of the lifetimes and the efficiency of singlet oxygen generation for a set of compounds (porphyrins, metalloporphyrins, porphycene, terrylene etc.) has been measured and characterized. Based on the character of the temperature dependence of singlet oxygen generation for metalloporphyrins and porphycene it was assumed a possibility of creation a complex between organic moieties and molecular oxygen. Singlet oxygen generation of terrylene with the quantum yield of 22% was recorded in toluene at ambient temperature.

Enhancement on the Hypocrellin B Singlet Oxygen Generation Quantum Yield in the Presence of Rare Earth Ions

2008 ◽  
Author(s):  
Daniel José Toffoli ◽  
Laércio Gomes ◽  
Nilson Dias Vieira Junior ◽  
Lilia Coronato Courrol ◽  
Niklaus Ursus Wetter ◽  
...  
Keyword(s):  
Rare Earth ◽  
Quantum Yield ◽  
Singlet Oxygen ◽  
Rare Earth Ions ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation ◽  
Hypocrellin B

Photophysical properties of sinoporphyrin sodium and explanation of its high photo-activity

2017 ◽  
Vol 21 (01) ◽  
pp. 59-66 ◽  
Author(s):  
Lixin Zang ◽  
Huimin Zhao ◽  
Qicheng Fang ◽  
Ming Fan ◽  
Tong Chen ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Singlet Oxygen ◽  
Extinction Coefficient ◽  
Photophysical Properties ◽  
Generation Efficiency ◽  
High Brightness ◽  
Extinction Coefficients ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation ◽  
Yield Formula

Sinoporphyrin sodium (DVDMS) is a novel photosensitizer with high photodynamic therapy (PDT) effect. Reasons for its high photo-activity were investigated according to the study of photophysical characteristics of DVDMS. Extinction coefficients ([Formula: see text] of DVDMS at 405 nm and 630 nm are 4.36 × 105 and 1.84 × 104 M[Formula: see text].cm[Formula: see text]; fluorescence quantum yield ([Formula: see text] is 0.026; quantum yield of lowest triplet state formation is 0.94 and singlet oxygen quantum yield ([Formula: see text] is 0.92. Although [Formula: see text] of DVDMS is only 10% higher than that of Photofrin[Formula: see text] (0.83), the extinction coefficient of DVDMS at 630 nm is 10-fold greater than that of Photofrin[Formula: see text]. This leads to its higher singlet oxygen generation efficiency ([Formula: see text]. The higher [Formula: see text] of DVDMS can result in an effective reduction of dosage (1/10 of Photofrin[Formula: see text] reaching the same cytotoxic effect as Photofrin[Formula: see text]. Even though [Formula: see text] is approximately equal to that of Photofrin[Formula: see text], brightness ([Formula: see text] of DVDMS is 10-fold greater than that of Photofrin[Formula: see text] because of the 10-fold greater extinction coefficient. Thus, fluorescence diagnosis ability of 0.2 mg/kg DVDMS is comparable to that of 2 mg/kg Photofrin[Formula: see text] used in PDT. Overall, the 10-fold greater extinction coefficients are responsible for the high brightness and singlet oxygen generation efficiency of DVDMS.

Synthesis, Spectro-Electrochemical Properties and Photoreaction with O2 of Lutetium Bis-ethyltetraazaporphyrin

1998 ◽  
Vol 02 (06) ◽  
pp. 517-526 ◽  
Author(s):  
GIAMPAOLO RICCIARDI ◽  
SANDRA BELVISO ◽  
MAURIZIO D'AURIA ◽  
FRANCESCO LELJ
Keyword(s):  
Quantum Yield ◽  
Singlet Oxygen ◽  
Electrochemical Properties ◽  
Ir Absorption ◽  
Type Ii ◽  
Neutral Species ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation ◽  
Near Ir ◽  
Photodynamic Activity

The synthesis, spectroscopic and electrochemical properties of the Lu ( oepz )2 (oepz ≡ 2,3,7,8,12,13,17,18-octakis(ethyl)-5,10,15,20-porphyrazinato) complex are reported. The complex, as inferred from UV-vis spectra recorded at different concentrations, strongly aggregates in solution, the most likely association mode being dimerization. The complex shows a weak near-IR absorption (λ max = 834 nm) that is considerably blue-shifted compared with the near-IR absorption of bis(π-radical) lutetium analogues. The Lu ( oepz )2 neutral species is electrochemically stable between 0.73 and -0.98 V (vs Ag/AgCl), which is the largest range of stability for neutral lutetium di- tetrapyrrole complexes. Lu ( oepz )2 shows excellent Type II photodynamic activity, as indicated by the value of the singlet oxygen generation quantum yield φΔ of 0.94 obtained by comparison with meso-tetraphenylporphyrin.

scholarly journals Сравнительные исследования фотофизических свойств димегина, фотодитазина и радахлорина

2019 ◽  
Vol 126 (2) ◽  
pp. 162
Author(s):  
И.В. Багров ◽  
А.В. Дадеко ◽  
В.М. Киселев ◽  
Т.Д. Муравьева ◽  
А.М. Стародубцев
Keyword(s):  
Quantum Yield ◽  
Singlet Oxygen ◽  
Fluorescence Quantum Yield ◽  
Photophysical Properties ◽  
Quantum Yields ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation

AbstractThe photophysical properties of three photosensitizers—dimegine, photoditazine, and radachlorin—have been comparatively examined. For dimegine and photoditazine, two techniques have been used to measure the singlet oxygen generation quantum yields and the quenching constants of singlet oxygen by dimegine and photoditazine, as well as the dimegine fluorescence quantum yield.

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