Modulation of the Rate of Reversible Electron Transfer in Oxidized Tryptophan and Tyrosine Containing Peptides in Acidic Aqueous Solution

2014 ◽  
Vol 119 (1) ◽  
pp. 140-149 ◽  
Author(s):  
Olga B. Morozova ◽  
Alexandra V. Yurkovskaya
Keyword(s):  
Aqueous Solution ◽  
Electron Transfer ◽  
Acidic Aqueous Solution ◽  
Reversible Electron Transfer

Kinetics of self-exchange of bis(1,4,7-trithiacyclononane)iron(III)/(II) in acetonitrile and in acidic aqueous solution

1990 ◽  
Vol 68 (12) ◽  
pp. 2228-2233 ◽  
Author(s):  
Hideo Doine ◽  
Thomas W. Swaddle
Keyword(s):  
Aqueous Solution ◽  
Electron Transfer ◽  
Ionic Strength ◽  
Line Broadening ◽  
Acidic Water ◽  
Exchange Reactions ◽  
Acidic Aqueous Solution ◽  
Spontaneous Reduction ◽  
Kinetics Of ◽  
C Nmr

The rate constant kex of the [Formula: see text] self-exchange reaction cannot be measured in most common solvents because of spontaneous reduction of the [Formula: see text] ion, which is also sensitive to photolysis by visible light. However, in CD3CN at −41 to −19 °C, reproducible proton-decoupled 13C NMR line broadening measurements are possible, and give kex = (5.3 ± 0.3) × 104 kg mol−1s−1 at 0 °C, ΔH* = 10.3 ± 1.8 kJ mol−1, and ΔS* = −116 ± 7 J K−1 mol−1, at ionic strength I = 0.1 mol kg−1. Proton NMR line broadening experiments are marginally practicable in very acidic water (2.0 mol kg−1 D2SO4/D2O) near 0 °C, and give kex = 3.2 × 106 kg mol−1 s−1 at 1 °C. The relative kex values of these and other low-spin/low-spin FeIII/II self-exchange reactions follow the predictions of the Marcus–Hush theory at least qualitatively. The effect of ionic strength, however, is less than predicted, probably because of the formation of less reactive anion–cation pairs. Keywords: electron transfer kinetics, crown thioether complexes.

Reversibility of Electron Transfer in Tryptophan−Tyrosine Peptide in Acidic Aqueous Solution Studied by Time-Resolved CIDNP

2005 ◽  
Vol 109 (8) ◽  
pp. 3668-3675 ◽  
Author(s):  
Olga B. Morozova ◽  
Alexandra V. Yurkovskaya ◽  
Renad Z. Sagdeev
Keyword(s):  
Aqueous Solution ◽  
Electron Transfer ◽  
Time Resolved ◽  
Acidic Aqueous Solution

Uniaxial magnetization performance of Co-Al2O3 nano-composite films electrochemically synthesized from acidic aqueous solution

2016 ◽  
Vol 20 (6) ◽  
pp. 1665-1672 ◽  
Author(s):  
C. Neetzel ◽  
T. Ohgai ◽  
T. Yanai ◽  
M. Nakano ◽  
H. Fukunaga
Keyword(s):  
Aqueous Solution ◽  
Composite Films ◽  
Nano Composite ◽  
Acidic Aqueous Solution
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