Quenching of Singlet Oxygen by Sodium Azide in Reversed Micellar Systems

Abstract The oxidation reaction of singlet oxygen with 1,3-diphenylisobenzofuran was investigated in cyclohexanic reversed micellar solutions of dodecylammonium propionate, using pyrene as photosensitizer. The furan oxidation was effectively inhibited by azide ion-bound reversed micelles. Empty reversed micelles also inhibited the furan oxidation to some extent. The inhibition of the furan oxidation was due to the quenching of singlet oxygen by azide ion-bound and empty reversed micelles. Such singlet oxygen quenching was dependent on the concentration of water added.Results obtained were discussed in connection with the polarity in the interior of reversed micelles, micellar size, the state of water solubilized in reversed micelles and the lifetime of singlet oxygen. The heavy atom effect on the quenching of singlet oxygen was also studied using heavy water.

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

Chemical Communications ◽

10.1039/d0cc08323b ◽

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.

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Singlet oxygen quenching by trolox C in aqueous micelle solutions

Journal of Photochemistry and Photobiology B Biology ◽

10.1016/j.jphotobiol.2009.08.010 ◽

2009 ◽

Vol 97 (3) ◽

pp. 132-137 ◽

Cited By ~ 20

Author(s):

Keishi Ohara ◽

Kaori Kikuchi ◽

Takashi Origuchi ◽

Shin-ichi Nagaoka

Keyword(s):

Singlet Oxygen ◽

Oxygen Quenching ◽

Singlet Oxygen Quenching ◽

Trolox C

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Hydroxyl radical scavenging and singlet oxygen quenching properties of polyamines

Molecular and Cellular Biochemistry ◽

10.1023/b:mcbi.0000038227.91813.79 ◽

2004 ◽

Vol 262 (1/2) ◽

pp. 127-133 ◽

Cited By ~ 83

Author(s):

Kumuda C. Das ◽

Hara P. Misra

Keyword(s):

Hydroxyl Radical ◽

Singlet Oxygen ◽

Radical Scavenging ◽

Oxygen Quenching ◽

Singlet Oxygen Quenching

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Singlet Oxygen Quenching by Phenylamides and their Parent Compounds

Zeitschrift für Naturforschung C ◽

10.1515/znc-2007-11-1211 ◽

2007 ◽

Vol 62 (11-12) ◽

pp. 833-838 ◽

Cited By ~ 8

Author(s):

Violeta B. Velikova ◽

Aglika M. Edreva ◽

Tsonko D. Tsonev ◽

Hamlyn G. Jones

Keyword(s):

Singlet Oxygen ◽

Hydroxycinnamic Acids ◽

Oxygen Quenching ◽

Amino Groups ◽

Plant Metabolites ◽

Antioxidant Defence ◽

Enzymatic Antioxidant ◽

Singlet Oxygen Quenching ◽

First Time ◽

Photosynthetic Centers

This paper demonstrates for the first time that plant metabolites of the phenylamide type, conjugates of putrescine with hydroxycinnamic acids (p-coumaric, caffeic and ferulic), possess 1O2 quenching properties. Data were obtained confirming that their acidic parent compounds were also able to quench 1O2, as did polyamines (putrescine, spermidine and spermine), and that this ability depends on the number of amino groups. Potentiation of the 1O2 quenching ability of the conjugates relative to both parent components was established. The importance of polyamines and phenylamides in the plant non-enzymatic antioxidant defence at sites of intensive 1O2 generation, such as the photosynthetic centers, was suggested.

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