Electron transfer between hemoglobin and arenediazonium salts. Mechanism of heme aryl-iron complex formation

1987 ◽  
Vol 26 (20) ◽  
pp. 3387-3392 ◽  
Author(s):  
Michael P. Doyle ◽  
Surendra N. Mahapatro ◽  
Judith K. Guy ◽  
Matthew R. Hester ◽  
Craig M. Van Zyl ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Complex Formation ◽  
Iron Complex ◽  
Arenediazonium Salts

ChemInform Abstract: Electron Transfer Between Hemoglobin and Arenediazonium Salts. Mechanism of Heme Aryl-Iron Complex Formation.

ChemInform ◽  
1988 ◽  
Vol 19 (4) ◽  
Author(s):  
M. P. DOYLE ◽  
S. N. MAHAPATRO ◽  
J. K. GUY ◽  
M. R. HESTER ◽  
C. M. VAN ZYL ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Complex Formation ◽  
Iron Complex ◽  
Arenediazonium Salts

Formation of CT complexes and electron transfer from excited molecules of anthracene derivatives to methylviologen in aqueous and micellar media

1987 ◽  
Vol 52 (7) ◽  
pp. 1658-1665
Author(s):  
Viktor Řehák ◽  
Jana Boledovičová
Keyword(s):  
Electron Transfer ◽  
Complex Formation ◽  
Fluorescence Quenching ◽  
Rate Constant ◽  
Formation Constants ◽  
Dynamic Quenching ◽  
Micellar Media ◽  
Complex Formation Constants ◽  
Anthracene Derivatives ◽  
Ct Complexes

Disodium 1,5- and 1,8-anthracenedisulphonate (ADS) and 9-acetylanthracene form coloured CT complexes with methylviologen (MV2+) in aqueous and micellar media. The complex formation constants and molar absorptivities were determined by the Benesi-Hildebrandt method. In the fluorescence quenching, its static component plays the major role. The dynamic quenching component is determined by the rate constant of electron transfer from the S1 state of ADS to MV2+.

scholarly journals Antioxidant activity of Spathodea campanulata (Bignoneaceae) extracts

2012 ◽  
Vol 14 (2) ◽  
pp. 287-292 ◽  
Author(s):  
S.C Heim ◽  
F.A Guarnier ◽  
D.T Ferreira ◽  
R Braz-Filho ◽  
R Cecchini ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Complex Formation ◽  
Mechanism Of Action ◽  
Iron Complex ◽  
Bark Extract ◽  
Flower Extract ◽  
Antioxidant Mechanism ◽  
Activity Loss ◽  
Ethanol Extracts ◽  
Antioxidant Mechanisms

Spathodea campanulata is used in traditional medicine in Africa as diuretic and anti-inflammatory. Although few studies have reported the mechanism of antioxidant action, this study evidenced the antioxidant activity of S. campanulata bark and flower extracts and their possible mechanism of action. Ethanol extracts of S. campanulata bark and flowers showed antioxidant activity on lipid peroxidation of liver microsome induced by Fe3+-ascorbic acid. Bark extract was 5 times more efficient than flower extract. The antioxidant activity of flower extract, previously complexed with increasing concentrations of Fe3+ (20 - 100 μM) which resulted in antioxidant activity loss, was shown to be related to iron complex formation. In contrast, the antioxidant activity of bark extract was not inhibited by the previous incubation with Fe3+, although complexation was demonstrated by spectral analysis of the solution. These results suggest an antioxidant mechanism other than Fe3+ complex formation. Therefore, the antioxidant mechanisms of S. campanulata flower and bark extracts are distinct from each other, reflecting the extract heterogeneous composition and the mechanism of action.

Competitive photoinduced electron transfer by the complex formation of porphyrin with cyclodextrin bearing viologen

2006 ◽  
pp. 4212 ◽  
Author(s):  
Wei Deng ◽  
Takeshi Onji ◽  
Hiroyasu Yamaguchi ◽  
Noriaki Ikeda ◽  
Akira Harada
Keyword(s):  
Electron Transfer ◽  
Complex Formation ◽  
Photoinduced Electron Transfer
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