Kinetics of the Reaction of Platinum(IV) Chloride Complex Ions in Aqueous Solution, in the Presence of C2H5OH

2016 ◽  
Vol 1 (8) ◽  
pp. 11-17
Author(s):  
Krzysztof Pacławski
Keyword(s):  
Aqueous Solution ◽  
Chloride Complex ◽  
Complex Ions ◽  
Kinetics Of

Substitution reactions of some bis(2,2'-bipyridine) and mixed 2,2'-bipyridine, 2,2',2'-terpyridine complexes of ruthenium(II). II. The kinetics of substitution of nitrite and other nucleophiles

1968 ◽  
Vol 21 (4) ◽  
pp. 915 ◽  
Author(s):  
NR Davies ◽  
TL Mullins
Keyword(s):  
Aqueous Solution ◽  
Low Frequency ◽  
Single Step ◽  
Second Order ◽  
Complex Ions ◽  
Substitution Reactions ◽  
Arrhenius Parameters ◽  
Nitro Complexes ◽  
Nucleophilic Reagents ◽  
Kinetics Of

The rates of substitution of the complex ions [Ru11(H2O)bipytrpy]2+ and [Ru11(H2O)2 bipy2]2+, where bipy = 2,2'-bipyridine and trpy = 2,2',2"-terpyridine, by a number of nucleophilic reagents in aqueous solution, have been determined as a function of temperature. The reactions were observed to be second order and rates fall in the sequence Ni > NO2 > SCN-> pyridine. The range of Arrhenius parameters is very large with some unusually low frequency factors. The diaquo complex appears to undergo substitution leading to disubstituted derivatives in a single step. In the case of substitution by nitrite, there is evidence that the final products are nitro complexes formed by rapid isomerization of intermediate nitrito complexes.

The kinetics of redox reaction of gold(III) chloride complex ions with l-ascorbic acid

2013 ◽  
Vol 395 ◽  
pp. 189-196 ◽  
Author(s):  
Magdalena Luty-Błocho ◽  
Krzysztof Pacławski ◽  
Marek Wojnicki ◽  
Krzysztof Fitzner
Keyword(s):  
Ascorbic Acid ◽  
Redox Reaction ◽  
Chloride Complex ◽  
Complex Ions ◽  
Kinetics Of

scholarly journals XAFS in the Tracking of Reactions in Aqueous Solution: a Case of Redox Reaction Between [AuCl4]– Complex Ions and Ethanol / Metoda XAFS W Badaniach Reakcji Zachodzących W Roztworach Wodnych: Przykład Reakcji Redoks Pomiędzy Jonami Kompleksowymi [AuCl4]- I Alkoholem Etylowym

2012 ◽  
Vol 57 (4) ◽  
pp. 1011-1020 ◽  
Author(s):  
K. Pacławski ◽  
M. SIKORA
Keyword(s):  
Aqueous Solution ◽  
Rate Constant ◽  
Potential Application ◽  
Kinetic Curve ◽  
Order Rate Constant ◽  
Metallic Phase ◽  
Complex Ions ◽  
Kinetic Measurements ◽  
Kinetics Of ◽  
Continuous Flow Method

In this work the potential application of synchrotron radiation in the studies of reaction kinetics in aqueous phase were presented. After short introduction describing principles of technique and potential application of XAFS for the structural studies of reacting species, the experimental results of kinetic measurements of reaction between gold(III) chloride complex ions and ethanol were presented. Analyzing the changes of absorption intensity in the XANES spectra registered at Au-L3 edge during the reaction, the change of the valence state of Au central atom (form 3+to 0) of reacting complex ion was determined. Moreover, empirical XANES data gave the chance to register the kinetic curve and to determine the rate constant of the studied reaction. It was found that reaction is relatively slow (second-order rate constant k = 3.66 · 10-5 M-1s) and lead to the gold metallic phase formation in the system. Applying the continuous-flow method, within the first 600 ms of reaction the changes in XANES spectra were registered. From the obtained results, supported with numerical calculations, two intermediate forms of adducts appearing prior the electron transfer were suggested. It was concluded that when the classic methods, e.g. UV-Vis spectrophotometry, cannot be applied to studies of kinetics of reactions in aqueous solution, the XAFS technique can be a valuable and substitutive (or supplementary) tool for such measurements.

Kinetics and mechanism of the reaction of iron(III) with 6-methyl-2,4-heptanedione and 3,5-heptanedione

1990 ◽  
Vol 55 (8) ◽  
pp. 1984-1990 ◽  
Author(s):  
José M. Hernando ◽  
Olimpio Montero ◽  
Carlos Blanco
Keyword(s):  
Aqueous Solution ◽  
Metal Ion ◽  
Activation Parameters ◽  
Enol Form ◽  
Kinetics And Mechanism ◽  
Kinetic Constants ◽  
Steric Factors ◽  
Kinetics Of ◽  
Mechanism Of The Reaction

The kinetics of the reactions of iron(III) with 6-methyl-2,4-heptanedione and 3,5-heptanedione to form the corresponding monocomplexes have been studied spectrophotometrically in the range 5 °C to 16 °C at I 25 mol l-1 in aqueous solution. In the proposed mechanism for the two complexes, the enol form reacts with the metal ion by parallel acid-independent and inverse-acid paths. The kinetic constants for both pathways have been calculated at five temperatures. Activation parameters have also been calculated. The results are consistent with an associative activation for Fe(H2O)63+ and dissociative activation for Fe(H2O)5(OH)2+. The differences in the results for the complexes of heptanediones studied are interpreted in terms of steric factors.

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