Effect of pH on the Photophysical and Redox Properties of a Ruthenium(II) Mixed Chelate Derived from Imidazole-4,5-dicarboxylic Acid and 2,2′-Bipyridine: An Experimental and Theoretical Investigation

2012 ◽  
Vol 116 (21) ◽  
pp. 5216-5226 ◽  
Author(s):  
Shyamal Das ◽  
Debasish Saha ◽  
Srikanta Karmakar ◽  
Sujoy Baitalik
Keyword(s):  
Dicarboxylic Acid ◽  
Theoretical Investigation ◽  
Redox Properties ◽  
Effect Of Ph

The effect of pH and complexation on redox reactions between RS• radicals and flavins

1984 ◽  
Vol 62 (1) ◽  
pp. 171-177 ◽  
Author(s):  
Rizwan Ahmad ◽  
David A. Armstrong
Keyword(s):  
Redox Potential ◽  
Linear Function ◽  
Redox Reactions ◽  
Flavin Adenine Dinucleotide ◽  
Protonated Form ◽  
Redox Properties ◽  
The Other ◽  
Effect Of Ph ◽  
Other Hand ◽  
High Redox Potential

Elementary considerations indicate that thiol radicals, RS•, should have a high redox potential [Formula: see text][Formula: see text]However, the equilibrium [4],[Formula: see text]which is established in the presence of excess RS−, would convert RS•to [Formula: see text] which is a reducing species. Experimentally it was demonstrated that thiol radicals made by γ radiolysis of β-mercaptoethanol solutions effected two-electron oxidation of dihydroflavin FlH2 at pH 6.3 and of FlH− at pH 8. On the other hand, [Formula: see text] readily reduced Fl to FlH2 or FlH− as expected. At pH 9, photostationary states were established after a few minutes radiolysis and the ratios [FlH−]ss/[Fl]ss were a function of [Formula: see text] The main reactions occurring were:[Formula: see text]The values of k19 and k22 were both large. The ratio k19/k22 was ∼0.8 for lumiflavin and ∼0.3 for flavin adenine dinucleotide. The cyclic disulphide anions of lipoamide and dithiothreitol [Formula: see text] also effected two-electron reductions of flavins. However, the protonated form of [Formula: see text] oxidized FlH2, and the photostationary ratio [FlH−]ss/[Fl]ss was an approximate linear function of [Formula: see text]. The implications of the observed changes in redox properties of sulphur radicals on complexation with RS− and protonation were briefly considered.Des considérations élémentaires indiquent que les radicaux thiyles, RS•, doivent avoir un potentiel rédox élevé [Formula: see text][Formula: see text]

Theoretical investigation of electronic properties and redox properties for purely inorganic and aryloxide substituted Ti-containing POM derivatives

2010 ◽  
Vol 108 (12) ◽  
pp. 1553-1560 ◽  
Author(s):  
Ping Song ◽  
Chun-Guang Liu ◽  
Wei Guan ◽  
Li-Kai Yan ◽  
Chan Yao ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Theoretical Investigation ◽  
Redox Properties

The effect of pH and ligand exchange on the redox properties of blue copper proteins

2000 ◽  
Vol 116 ◽  
pp. 205-220 ◽  
Author(s):  
Gerard W. Canters ◽  
Urszula Kolczak ◽  
Fraser Armstrong ◽  
Lars J. C. Jeuken ◽  
Raul Camba ◽  
...  
Keyword(s):  
Ligand Exchange ◽  
Redox Properties ◽  
Copper Proteins ◽  
Blue Copper Proteins ◽  
Blue Copper ◽  
Effect Of Ph

Inhibition effect and theoretical investigation of dicarboxylic acid derivatives as corrosion inhibitor for aluminium alloy

2020 ◽  
Vol 71 (8) ◽  
pp. 1289-1299
Author(s):  
Daquan Zhang ◽  
Hanxue Yang ◽  
Xiaohui Li ◽  
ShiLin Chen ◽  
Lixin Gao ◽  
...  
Keyword(s):  
Dicarboxylic Acid ◽  
Aluminium Alloy ◽  
Corrosion Inhibitor ◽  
Theoretical Investigation ◽  
Inhibition Effect

Theoretical investigation of low-valent uranium and transuranium complexes of a flexible small-cavity macrocycle: structural, formation reaction and redox properties

2016 ◽  
Vol 45 (40) ◽  
pp. 15970-15982 ◽  
Author(s):  
Zhe Bao ◽  
Hong-Bo Zhao ◽  
Ning Qu ◽  
Georg Schreckenbach ◽  
Qing-Jiang Pan
Keyword(s):  
Theoretical Investigation ◽  
Redox Properties ◽  
Structural Formation ◽  
Formation Reaction ◽  
Coordination Modes ◽  
Small Cavity ◽  
Low Valent

Size matching of a flexible macrocycle with low-valent actinide(III/IV) ions as well as their bonding determines different coordination modes.

Sign in / Sign up

Export Citation Format

Share Document