Time resolved FT EPR study of the decarboxylation following photo-induced electron transfer between α-amino acids and anthraquinone-2,6-disulfonic acid in aqueous solution

2001 ◽  
Vol 3 (11) ◽  
pp. 2053-2058 ◽  
Author(s):  
Jian-Ming Lü ◽  
L. M. Wu ◽  
J. Geimer ◽  
D. Beckert
Keyword(s):  
Aqueous Solution ◽  
Amino Acids ◽  
Electron Transfer ◽  
Disulfonic Acid ◽  
Time Resolved ◽  
Photo Induced Electron Transfer

Electron Transfer between Guanosine Radical and Amino Acids in Aqueous Solution. 1. Reduction of Guanosine Radical by Tyrosine

2007 ◽  
Vol 111 (25) ◽  
pp. 7439-7448 ◽  
Author(s):  
Olga B. Morozova ◽  
Alexey S. Kiryutin ◽  
Renad Z. Sagdeev ◽  
Alexandra V. Yurkovskaya
Keyword(s):  
Aqueous Solution ◽  
Amino Acids ◽  
Electron Transfer

Excess electron reactivity in amino acid aqueous solution revealed by ab initio molecular dynamics simulation: anion-centered localization and anion-relayed electron transfer dissociation

2015 ◽  
Vol 17 (40) ◽  
pp. 26854-26863 ◽  
Author(s):  
Xiuxiu Wu ◽  
Liang Gao ◽  
Jinxiang Liu ◽  
Hongfang Yang ◽  
Shoushan Wang ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Aqueous Solution ◽  
Amino Acids ◽  
Electron Transfer ◽  
Molecular Dynamics Simulation ◽  
Electron Transfer Dissociation ◽  
Dynamics Simulation ◽  
Ab Initio Molecular Dynamics ◽  
Secondary Electrons ◽  
Acid Aqueous Solution

Radiation-generated secondary electrons can interact with glycine or the backbone parts of amino acids in different modes in aqueous solution.

Electron transfer vs. proton-coupled electron transfer as the mechanism of reaction between amino acids and triplet-excited benzophenones revealed by time-resolved CIDNP

2018 ◽  
Vol 20 (32) ◽  
pp. 21127-21135 ◽  
Author(s):  
Olga B. Morozova ◽  
Mikhail S. Panov ◽  
Natalya N. Fishman ◽  
Alexandra V. Yurkovskaya
Keyword(s):  
Amino Acids ◽  
Electron Transfer ◽  
Reaction Mechanism ◽  
Hyperfine Coupling ◽  
Coupling Constants ◽  
Hyperfine Coupling Constants ◽  
Time Resolved ◽  
Proton Coupled Electron Transfer ◽  
Mechanism Of Reaction

We use proportionality between NMR signal enhancements in geminate products and hyperfine coupling constants in transient radicals to elucidate reaction mechanism in detail.

Radiation Chemical Studies of the Oxidation of Aniline in Aqueous Solution

1985 ◽  
Vol 40 (10) ◽  
pp. 1026-1039 ◽  
Author(s):  
Ling Qin ◽  
G. N. R. Tripathi ◽  
Robert H. Schüler
Keyword(s):  
Aqueous Solution ◽  
Electron Transfer ◽  
Radical Cation ◽  
Time Scale ◽  
Radical Cations ◽  
Oh Radicals ◽  
Basic Solution ◽  
Direct Oxidation ◽  
Time Resolved ◽  
Radiation Chemical

Oxidation of aniline in aqueous solution by ·OH radicals proceeds predominantly via addition to the ring followed by elimination of OH- on the microsecond time scale to form the aniline radical cation. Direct oxidation by electron transfer accounts for less than 4% of the ·OH reactions. The different hydroxycyclohexadienyl isomers produced by ·OH addition decay at different rates with this decay catalyzed both by protons and phosphate. In basic solution the resultant radical cation deprotonates to form the anilino radical. The p Ka for the equilibrium between the acidic and basic forms of this radical is 7.05 ± 0.05. Secondary radicals such as Br2·- or N3· oxidize aniline directly by electron transfer and allow rapid preparation of the radical cation even in basic solution, as is conclusively demonstrated by observation of the Raman spectrum of the radical cation on the nanosecond time scale at pH 10.4. The deprotonation process can be followed directly by time resolved absorption spectrophotometry in the pH range of 9 - 11 and is shown to occur via reaction of the radical cation with OH- at a rate constant of 2.2 x 1010 M-1 s-1. Reaction of anilino radical with water is relatively slow (k ~ 2 x 103 s-1). Time resolved Raman methods show that benzidine radical cation is an important tertiary transient, indicating that second order reaction between radical cations results to an appreciable extent from coupling at ring positions.

Ultrafast static and diffusion-controlled electron transfer at Ag29 nanocluster/molecular acceptor interfaces

Nanoscale ◽  
2016 ◽  
Vol 8 (10) ◽  
pp. 5412-5416 ◽  
Author(s):  
Shawkat M. Aly ◽  
Lina G. AbdulHalim ◽  
Tabot M. D. Besong ◽  
Giada Soldan ◽  
Osman M. Bakr ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Transient Absorption ◽  
Time Resolved Fluorescence ◽  
Time Resolved ◽  
Diffusion Controlled ◽  
Photo Induced Electron Transfer ◽  
And Diffusion

We quantitatively separate the contributions of static and collision-caused photo-induced electron transfer from Ag29NC clusters to MV2+ through both transient absorption and time-resolved fluorescence experiments.

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