Oxygen quenching of the excited MLCT state of ruthenium (II) bipyridyl heteroleptic complexes and singlet oxygen thereby produced

2019 ◽  
Vol 36 (1) ◽  
pp. 242-251
Author(s):  
Karim El-Naggar ◽  
Hesham Abdel-Samad ◽  
Mohamed El-Khouly ◽  
Ayman Abdel-Shafi ◽  
Ramadan Ramadan
Keyword(s):  
Singlet Oxygen ◽  
Oxygen Quenching ◽  
Heteroleptic Complexes ◽  
Mlct State

Oxygen quenching of the excited MLCT state of ruthenium (II) bipyridyl heteroleptic complexes and singlet oxygen thereby produced

2019 ◽  
Vol 36 (1) ◽  
pp. 539-551
Author(s):  
Karim El-Naggar ◽  
Hesham S. Abdel-Samad ◽  
Mohamed E. El-Khouly ◽  
Ayman A. Abdel-Shafi ◽  
Karim El-Naggar
Keyword(s):  
Singlet Oxygen ◽  
Oxygen Quenching ◽  
Heteroleptic Complexes ◽  
Mlct State

Singlet oxygen quenching by trolox C in aqueous micelle solutions

2009 ◽  
Vol 97 (3) ◽  
pp. 132-137 ◽  
Author(s):  
Keishi Ohara ◽  
Kaori Kikuchi ◽  
Takashi Origuchi ◽  
Shin-ichi Nagaoka
Keyword(s):  
Singlet Oxygen ◽  
Oxygen Quenching ◽  
Singlet Oxygen Quenching ◽  
Trolox C

scholarly journals Singlet Oxygen Quenching by Phenylamides and their Parent Compounds

2007 ◽  
Vol 62 (11-12) ◽  
pp. 833-838 ◽  
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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