Kinetics and Mechanism of Redox Reaction between Tetrachloroaurate(III) Ions and Hydrazine

Streszewski, Bartłomiej; Jaworski, Wiktor; Szaciłowski, Konrad; Pacławski, K.

doi:10.1002/kin.20850

Cited by 13 publications

(12 citation statements)

References 18 publications

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“…This proposition is quite in agreement with a number of gold(III)mediated redox reactions. 54,55 Again, the existence of transient Au(II) species has also been affirmed by Soni et al 23 in the kinetic studies of oxidation of L-histidine by tetrachloroaurate-(III). A detailed mechanism showing different reaction steps is described in Scheme 4 considering AuCl 4…”

Section: Effects Of [H + ] and [Cl −mentioning

confidence: 77%

Influence of Microheterogeneous Environments of Sodium Dodecyl Sulfate on the Kinetics of Oxidation of l-Serine by Chloro and Chlorohydroxo Complexes of Gold(III)

Maiti

Sen

Barik³

et al. 2018

J. Phys. Chem. A

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The oxidation of l-serine by chloro and chlorohydroxo complexes of gold(III) was spectrophotometrically investigated in acidic buffer media in the absence and presence of the anionic surfactant sodium dodecyl sulfate (SDS). The oxidation rate decreases with increase in either [H] or [Cl]. Gold(III) complex species react with the zwitterionic form of serine to yield acetaldehyde (principal reaction product) through oxidative decarboxylation and subsequent deamination processes. A reaction pathway involving one electron transfer from serine to Au(III) followed by homolytic cleavage of α-C-C bond with the concomitant formation of iminic cation intermediate has been proposed where Au(III) is initially reduced to Au(II). The surfactant in the submicellar region exhibits a catalytic effect on the reaction rate at [SDS] ≤ 4 mM; however, in the postmicellar region an inhibitory effect was prominent at [SDS] ≥ 4 mM. The catalytic effect below the critical micelle concentration (cmc) may be attributable to the electrostatic attraction between serine and SDS that, in turn, enhances the nucleophilicity of the carboxylate ion of the amino acid. The inhibition effect beyond cmc has been explained by considering the distribution of the reactant species between the aqueous and the micellar pseudophases that restricts the close association of the reactant species. The thermodynamic parameters Δ H and Δ S associated with the binding between serine and SDS micelle were calculated to be -14.4 ± 2 kJ mol and -6.3 ± 0.5 J K mol, respectively. Water structure rearrangement and micelle-substrate binding play instrumental roles during the transfer of the reactant species from aqueous to micellar pseudophase.

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Section: Effects Of [H + ] and [Cl −mentioning

confidence: 77%

Influence of Microheterogeneous Environments of Sodium Dodecyl Sulfate on the Kinetics of Oxidation of l-Serine by Chloro and Chlorohydroxo Complexes of Gold(III)

Maiti

Sen

Barik³

et al. 2018

J. Phys. Chem. A

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“…The size and shape of synthesized nanomaterials can be tuned by various parameters, among them are temperature , pH of the solution , ions additions, reagents concentration , and reagents “nature” (strong, mild). It is obvious that “strong” reductants, such as sodium borohydride , hydrate hydrazine , and dimethyloaminoborane , lead to small semispherical particles formation with excellent catalytic properties. However, more and more reports indicate that shape has also influence on catalyzed process efficiency .…”

Section: Introductionmentioning

confidence: 99%

Linking the Gold Nanoparticles Formation Kinetics with Their Morphology

Luty–Błocho

Wojnicki

Grzonka

et al. 2018

Int J of Chemical Kinetics

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In this paper, we show that using different concentrations of reagents, it is possible to produce gold nanoparticles with different morphology (size, shape). The color of obtained colloidal gold change from pink, violet to blue, and it corresponds to the shape change. The pink color corresponds to spherical nanoparticles and the blue one to a star shape. The mixture of those two types of nanoparticles result in a violet tone. It was also shown that kinetics of nucleation and growth process is controlled by the reaction on the gold atoms surface, i.e., comproportionation of Au(III) and Au(0) to Au(I), which can be inhibited by varying precursor and reductant concentration.

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“…A reduction method can also be applied for precious metal recovery. For example, vitamin C [18,19], sodium borohydrate [20], DMAB [21][22][23], hydrazine [24], ethanol [25], and methanol [26] can be used as reductants. First of all, those methods are not selective, i.e.…”

Section: Introductionmentioning

confidence: 99%

Kinetic studies of the removal of Pt(IV) chloride complex ions from acidic aqueous solutions using activated carbon

Wojnicki

Socha

Fitzner

2017

Reac Kinet Mech Cat

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In this paper, results showing the possibility of activated carbon application in platinum recovery from aqueous solution are presented. The studies were performed with the commercially available activated carbon, and the results can be easily transferred directly to the industry. The influence of pH, mixing rate, and amount of activated carbon as well as platinum(IV) initial concentration on the rate of adsorption was investigated. It was shown that after adsorption platinum is present on the surface of activated carbon in two oxidation states, ?2 and ?4, where shares of those forms are equal to 47 and 53%. Moreover, the enthalpy and entropy of activation were determined and are equal to 16.14 ± 075 kJ mol -1 and 42.19 ± 0.28 J mol -1 K -1 .

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Kinetics and Mechanism of Redox Reaction between Tetrachloroaurate(III) Ions and Hydrazine

Cited by 13 publications

References 18 publications

Influence of Microheterogeneous Environments of Sodium Dodecyl Sulfate on the Kinetics of Oxidation of l-Serine by Chloro and Chlorohydroxo Complexes of Gold(III)

Influence of Microheterogeneous Environments of Sodium Dodecyl Sulfate on the Kinetics of Oxidation of l-Serine by Chloro and Chlorohydroxo Complexes of Gold(III)

Linking the Gold Nanoparticles Formation Kinetics with Their Morphology

Kinetic studies of the removal of Pt(IV) chloride complex ions from acidic aqueous solutions using activated carbon

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