Reduction potential of the nitrate radical in aqueous solution

1992 ◽  
Vol 31 (24) ◽  
pp. 5135-5136 ◽  
Author(s):  
Pei Yun Jiang ◽  
Yosuke Katsumura ◽  
Kenkichi Ishigure ◽  
Yoichi Yoshida
Keyword(s):  
Aqueous Solution ◽  
Reduction Potential ◽  
Nitrate Radical

Kinetics of the Reaction Between S2O3-- and I3- in Aqueous Solution

1974 ◽  
Vol 29 (1) ◽  
pp. 141-144
Author(s):  
T. S. Rao ◽  
S. I. Mali
Keyword(s):  
Aqueous Solution ◽  
Reduction Potential ◽  
Frequency Factor ◽  
Effective Concentration ◽  
Specific Rate ◽  
Platinum Foil ◽  
First Order ◽  
Entropy Of Activation ◽  
Kinetics Of ◽  
Foil Electrode

The kinetics of the reaction between has been studied under conditions of production of iodine at a known rate by the persulfate-iodide reaction and its consumption by S2O3-- . The effective concentration of iodine during the steady state is measured from its reduction potential at a bright platinum foil electrode. The reaction is of first order with respect to I3- and S2O3-- individually and hence of over all second order. The specific rate is 1.51 X 105 M -1 sec-1 and the frequency factor is 1.69 × 1012 M -1 sec-1 at 25 °C. The energy of activation for the reaction is 9.58 × 103 cal/mole and the entropy of activation is -2.55 cal/mole deg.

Free-radical reductions of arenediazonium ions in aqueous solution. V. Pulse-radiolytic determination of rate constants for some para-substitutedbenzenediazonium ions

1981 ◽  
Vol 34 (7) ◽  
pp. 1433 ◽  
Author(s):  
JE Packer ◽  
J Monig ◽  
BC Dobson
Keyword(s):  
Aqueous Solution ◽  
Free Radical ◽  
Rate Constants ◽  
Substituent Effect ◽  
Reduction Potential ◽  
Radical Anions ◽  
Semiquinone Radical ◽  
Substituent Group

Some rate constants for the reduction of para-substituted benzenediazonium ions by the radicals eaq-, ·CH2OH, (CH3)2·COH and some semiquinone radical anions have been measured. The substituent group has no effect on the rates with eaq-, but as the reduction potential of the reducing radical becomes more positive, the substituent effect increases, electron-withdrawing groups enhancing the rates. No free halide is formed on reduction of p-BrC6H4N2+ or p-IC6H4N2+ by eaq- or ·CH2OH.

Study of nitrate radical (NO3) reactions with carbonyls and acids in aqueous solution as a function of temperature

2007 ◽  
Vol 9 (8) ◽  
pp. 958-968 ◽  
Author(s):  
Ph. Gaillard de Sémainville ◽  
D. Hoffmann ◽  
Ch. George ◽  
H. Herrmann
Keyword(s):  
Aqueous Solution ◽  
Nitrate Radical

scholarly journals A Computational Investigation of the Binding of the Selenium Analogues of Ergothioneine and Ovothiol to Cu(I) and Cu(II) and the Effect of Binding on the Redox Potential of the Cu(II)/Cu(I) Redox Couple

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Jacqueline Wiebe ◽  
Vasyl Zaliskyy ◽  
Eric A. C. Bushnell
Keyword(s):  
Aqueous Solution ◽  
Oxidative Damage ◽  
Reduction Potential ◽  
Redox Couple ◽  
Computational Investigation ◽  
Dft Methods ◽  
Reduction Potentials ◽  
Redox Couples ◽  
Concomitant Reduction ◽  
Dilute Aqueous Solution

The complexes formed from the binding of ovoselenol (OSeH) and ergoseloneine (ESeH) to Cu(II) and Cu(I) have been investigated with DFT methods. From the calculated thermodynamics, the binding of OSeH and ESeH to Cu(II) and Cu(I) ions increases the reduction potential for the Cu(II)/Cu(I) redox couple. The calculated reduction potentials for the Cu(II)(OSe)2/Cu(I)(OSeH)3+ and Cu(II)(ESe)2/Cu(I)(ESeH)3+ redox couples were found to be 1.15 V and 1.24 V in a dilute aqueous solution. By combining the half reactions for the oxidation of OSeH to the diselenide OSeSeO with the reduction of Cu(II)(OSe)2 to Cu(I)(OSeH)3+, the calculated EMF was 0.90 V. For the oxidation of ESeH to the diselenide ESeSeE with the concomitant reduction of Cu(II)(ESe)2 to Cu(I)(ESeH)3+, the calculated EMF was 0.67 V. Thus, for both systems, the reduction of Cu(II) to Cu(I) with concomitant formation of either diselenide is thermodynamically favourable, and it is expected that both OSeH and ESeH are suitable for the protection against copper induced oxidative damage. As a result, the inhibition of the recycling of Cu(I) to Cu(II) is thermodynamically favourable in the presence of OSeH and ESeH.

scholarly journals Reductive deposition of Au3+(aq) on oxidized silicon surfaces

2000 ◽  
Vol 78 (4) ◽  
pp. 516-519 ◽  
Author(s):  
Sefik Süzer ◽  
Ömer Dag
Keyword(s):  
Aqueous Solution ◽  
Corona Discharge ◽  
Oxidation State ◽  
Photoelectron Spectroscopy ◽  
Silicon Surface ◽  
Electroless Deposition ◽  
Reduction Potential ◽  
Gold Deposits ◽  
Silicon Surfaces ◽  
X Ray

X-ray photoelectron spectroscopy (XPS) is used to determine the oxidation state of gold deposited from an aqueous solution of AuCl4- on to various oxidized surfaces of silicon. Although the observed Au4f signal decreased with the thickness of the oxide layer, the oxidation state of Au was determined as 0 for all the samples analyzed. From the angular dependence of the Si2p and Au4f signals it was determined that Au is deposited on top of the oxidized surfaces of metallic silicon. It is postulated that from an aqueous solution of AuCl4-, gold would deposit in its zerovalent form on to any surface due to its large and positive electrochemical reduction potential (ε°red(Au3+ /Au) = +1.50 V) and the substrate plays a role only in providing active deposition sites. To further support the proposal, it is shown that the same process takes place even in inert and hydrophobic polypropylene substrates. Similarly, it is also shown that more gold deposits if the surface of the polypropylene is made less hydrophobic (but probably more active) via the industrially used corona discharge treatment.Key words: XPS, gold, electroless deposition, oxidized silicon surface.

Study on Thiourea Dioxide’s Reducing Capacity and its Reactivity with Reactive Dyes

2011 ◽  
Vol 396-398 ◽  
pp. 1174-1179 ◽  
Author(s):  
Lan Zhou ◽  
Xiao Yun Liu ◽  
Jian Zhong Shao ◽  
Ya Ni Chen
Keyword(s):  
Aqueous Solution ◽  
Reduction Potential ◽  
Ph Value ◽  
Reactive Dyes ◽  
Potential Change ◽  
Analysis Method ◽  
Potential Analysis ◽  
Thiourea Dioxide ◽  
Effects Of Ph ◽  
Reducing Capacity

In this paper, potential analysis method was applied to study the effects of pH value and temperature on potential and reducing capacity of thiourea dioxide, and the reactivity between thiourea dioxide and reactive dyes as ground shade dyes under simulated printing steaming conditions in aqueous solution was also investigated. The results showed that thiourea dioxide’s reduction potential increased with the rise of pH value and temperature. when temperature was lower than 60 °C, thiourea dioxide had low reactivity with reactive dyes as ground shade dyes, and when temperature was up to 80 °C, thiourea dioxide began to break reactive dyes, which was in accordance with the reduction potential change rule of thiourea dioxide along with temperature.

Derivatives of 1,10-Phenanthroline-5,6-quinone

1970 ◽  
Vol 23 (5) ◽  
pp. 1023 ◽  
Author(s):  
JE Dickeson ◽  
LA Summers
Keyword(s):  
Aqueous Solution ◽  
Electron Transfer ◽  
Chelating Agents ◽  
Reduction Potential ◽  
Heterocyclic System ◽  
Cupric Chloride ◽  
Ethylene Dibromide ◽  
Standard Methods ◽  
Standard Calomel Electrode ◽  
Derivatives Of

1,l0-Phenanthroline-5,6-quinone is prepared from 1,l0-phenanthroline via 5-nitro-1,l0-phenanthroline and 5-amino-1,l0-phenanthroline. It is converted by standard methods into 4,5-diazafluoren-9-one, 4,5-diazafluoren-9-ol,4,5-diazafluorene, and the new heterocyclic system dipyrido[3,2-a:2',3'-clphenazine. These four compounds each form a complex with cupric chloride. They thus represent a new series of chelating agents. By reaction with ethylene dibromide, dipyrido[3,2-a:2',3'-c]-phenaiine forms a diquaternary salt which is reduced in aqueous solution by a one-electron transfer to a highly coloured radical cation. Polarography experiments show that the reduction potential of the salt is -0.40 V against a standard calomel electrode.

Diammonium Salts Derived From 1,4-Diazabicyclo[2.2.2]octane

1994 ◽  
Vol 47 (1) ◽  
pp. 7 ◽  
Author(s):  
A Bayada ◽  
GA Lawrance ◽  
M Maeder
Keyword(s):  
Aqueous Solution ◽  
Electrochemical Reduction ◽  
Functional Group ◽  
Reduction Potential ◽  
Hofmann Elimination

The syntheses of a range of quaternary diammonium and some monoammonium salts derived from 1,4-diazabicyclo[2.2.2]octane with N-alkyl arms or N-alkyl arms terminated by a functional group are reported. In aqueous solution they are susceptible to only very slow Hofmann elimination, and the kinetics were investigated for the 1-(2′-ammonioethyl)-4-dodecyl-1,4-diazoniabicyclo[2.2.2]octane ion, which undergoes a base-induced elimination ( kOH 6.9×10-4 dm3 mol-1 s-1 at 55°C) consistent with an ElcB mechanism. In aqueous solution, the diammonium cations are not oxidized but undergo irreversible electrochemical reduction below -1.2 V v . Ag/ AgCl , with the reduction potential apparently influenced by the electron-withdrawing or -donating nature of substituent arms.

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