Pulse Radiolysis Studies. I. Transient Spectra and Reaction‐Rate Constants in Irradiated Aqueous Solutions of Benzene

1962 ◽  
Vol 36 (11) ◽  
pp. 3051-3061 ◽  
Author(s):  
Leon M. Dorfman ◽  
I. A. Taub ◽  
R. E. Bühler
Keyword(s):  
Aqueous Solutions ◽  
Rate Constants ◽  
Pulse Radiolysis ◽  
Reaction Rate ◽  
Reaction Rate Constants ◽  
Transient Spectra

Reactions of thiyl radicals with phenothiazines and other antioxidants in aqueous solutions. A pulse radiolysis study

1990 ◽  
Vol 68 (8) ◽  
pp. 1376-1382 ◽  
Author(s):  
Manohar Lal ◽  
H. S. Mahal
Keyword(s):  
Molecular Weight ◽  
Ascorbic Acid ◽  
Aqueous Solutions ◽  
Rate Constants ◽  
Pulse Radiolysis ◽  
Reaction Rate ◽  
Mercaptopropionic Acid ◽  
Molecular Weights ◽  
Reaction Rate Constants ◽  
Thiyl Radicals

Reaction rate constants of thiyl radicals with phenothiazines, promethazine (PMZ), chlorpromazine (CPZ), prochlorperazine (PPZ), trimeperazine tarterate (TPZ), and other antioxidants, e.g., ascorbic acid and 2,2-azinobis(3-ethyl benzthiazoline-6 sulphonate) (ABTS) have been estimated using pulse radiolysis technique. In general they are quite high (108–109 M−1 s−1). The k values for cysteine, cysteamine, mercaptoethanol, and mercaptopropionic acid with similar structures and molecular weights are more or less similar for PMZ, CPZ, and PPZ.Rate constants are lower in value for [Formula: see text] radicals of phenothiazines showing that they are dependent upon the structure and the molecular weight of the compound.Rate constants are the same whether the thiyl radicals are generated from thiols or their corresponding disulphides. The k values for chlorine-containing phenothiazines, chlorpromazine, and prochlorperazine are higher than those of promothazine Keywords: pulse radiolysis, thiyl radicals, phenothiazines, ABTS, ascorbic acid.

Pulse Radiolysis of Nitric Oxide in Aqueous Solution

1973 ◽  
Vol 51 (7) ◽  
pp. 1123-1130 ◽  
Author(s):  
W. A. Seddon ◽  
J. W. Fletcher ◽  
F. C. Sopchyshyn
Keyword(s):  
Nitric Oxide ◽  
Pulse Radiolysis ◽  
Reaction Rate ◽  
Dissociation Constants ◽  
Acid Dissociation ◽  
Acid Dissociation Constants ◽  
Reaction Rate Constants ◽  
Wide Range ◽  
Transient Spectra ◽  
Computer Calculations

Transient spectra observed on the pulse radiolysis of aqueous solutions of nitric oxide at pH 7.0 have been assigned to the species NO−, N2O2−, and N3O3−. In acid solution these species are protonated to form the corresponding acids, HNO, HN2O2, and HN3O3. Both the basic and acid forms undergo similar reactions, but at different rates, to form the products of radiolysis N2O and NO2−.[Formula: see text]The basic species decays more slowly than the corresponding acid species but both processes have appreciable activation energies of 15 and 10 kcals/mol, respectively. Computer calculations have been used in conjunction with the experimental data over a wide range of pH and NO concentration to deduce a reaction mechanism consistent with the observed results. Reaction rate constants, acid dissociation constants and extinction coefficients for the various species are presented and compared with earlier work.

scholarly journals Aquation reaction of iminodiacetate complex of oxidovanadium(IV) with 2,2’-bipyridine induced by Fe(III) ions: Kinetic studies

2019 ◽  
Vol 44 (4) ◽  
pp. 300-306
Author(s):  
Joanna Drzeżdżon ◽  
Agnieszka Piotrowska-Kirschling ◽  
Lech Chmurzyński ◽  
Dagmara Jacewicz
Keyword(s):  
Aqueous Solutions ◽  
Computer Program ◽  
Rate Constants ◽  
Reaction Rate ◽  
Kinetic Studies ◽  
Reaction Rate Constants ◽  
Different Temperatures ◽  
Kinetics Of

The kinetics of the aquation reaction of the [VO(ida)(bipy)]·2H2O (VO(ida)(bipy)) complex (where ida = iminodiacetate anion and bipy = 2,2’-bipyridine) promoted by [Fe(H2O)6]3+ ions were investigated in aqueous solutions. Spectrophotometric studies were carried out at different temperatures in the range of 293.15–313.15 K. The concentration of the [Fe(H2O)6]3+ (Fe3+) ions was kept within the range of 2 × 10–4 to 8 × 10–4 mol L–1, and the concentration of VO(ida)(bipy) was 1 × 10–3 mol L–1. The values of the observable reaction rate constants were calculated based on the Glint computer program. Furthermore, the mechanism for the aquation of VO(ida)(bipy), induced by Fe(III) ions, has been proposed.

scholarly journals Studies on the Thiophene Analogues of Malachite Green. I. Protolytic Equilibria and Reaction Rate Constants of Thiophene Green in Aqueous Solutions.

1962 ◽  
Vol 16 ◽  
pp. 1837-1848 ◽  
Author(s):  
Rune Cigén ◽  
Gösta Bengtsson ◽  
Svend Erik Rasmussen ◽  
A. Block-Bolten ◽  
J. M. Toguri ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Malachite Green ◽  
Rate Constants ◽  
Reaction Rate ◽  
Protolytic Equilibria ◽  
Reaction Rate Constants
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