Studies of the Effect of Thiourea on the Electroreduction of In(III) Ions in Perchloric Acid

Nosal‐Wiercińska, Agnieszka; Dalmata, Grażyna

doi:10.1002/1521-4109(200210)14:18<1275::aid-elan1275>3.0.co;2-p

Cited by 18 publications

(22 citation statements)

References 18 publications

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“…The cathode peaks, similar that found in the presence of TU [45], DMTU [46] or ATU, are considerably lower and worse-defined than the anodic peaks, which confirms that the electroreduction process of In(III) ions is controlled by the preceding reaction [47]. With the increase of TU concentration and its derivatives studied the distances between the cathode and anodic peaks decrease, which points to an increase of reversibility of the electroreduction process of In(III) ions in the presence of the studied organic substances.…”

Section: Fig 5 Presents Cyclic Chronovoltammetric Curves Recorded Insupporting

confidence: 78%

“…After the addition of TU [45], MTU, DMTU [46] or ATU to the solution the acceleration of the electroreduction process of In(III) ions occurs. The DC wave of In(III) ions electroreduction in 1 mol dm -3 NaClO 4 pH = 2 is well-defined (Fig.…”

Section: Kinetic Measurementsmentioning

confidence: 99%

“…The kinetic parameters values for systems In(III)-TU and In-DMTU were taken from [45,46]; and for systems In(III)-MTU and In(III)-ATU from chronovoltammetric measurements. All calculations were based on the theoretical equations of Nicholson and Shain for the processes proceeding on plate electrodes [48,49], which can be applied with a slight error for globular electrodes, fulfilling the condition r 2 n ≥ 10 -4 cm 2 V s -1 [50,51] (r -electrode radius).…”

Section: Fig 5 Presents Cyclic Chronovoltammetric Curves Recorded Inmentioning

confidence: 99%

“…The diffusion coefficient (D ox ) of In(III) ions in the studied solutions was determined from Randles and Ševčik equation [53][54]: -3 mol dm -3 In(III) electroreduction in 1 mol dm -3 NaClO 4 pH = 2 in the presence of: thiourea (◊) [45], N-methylthiourea (♦), N,N'-dimethylthiourea (▲) [46], N-allylthiourea (D) on adsorbate surface excess (Г′). The transfer coefficient (an a ) of electroreduction reaction of In(III) ions in the studied systems was determined using equation [56,57]:…”

Section: Fig 5 Presents Cyclic Chronovoltammetric Curves Recorded Inmentioning

confidence: 99%

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Catalytic activity of thiourea and its selected derivatives on electroreduction of In(III) in chlorates(VII)

Nosal‐Wiercińska

2010

Open Chemistry

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It was found that thiourea, N-methylthiourea, N,N'-dimethylthiourea and N-allylthiourea accelerate the electroreduction process of In(III) ions in chlorates(VII). These substances are adsorbed on mercury from chlorates(VII). The relative surface excesses of thiourea and its derivatives increase with the increase of their concentrations and electrode charge. After adding thiourea, N-methylthiourea, N,N'-dimethylthiourea and N-allylthiourea to the solution an acceleration of the electroreduction process of In(III) ions occurs. This process depends on two factors: the adsorption of an accelerating substance on mercury and on the formation of complexes between a depolarizer and an accelerating substance on the electrode surface. The equilibrium of this complexing reaction determines the magnitude of the catalytic effect.© Versita Warsaw and Springer-Verlag Berlin Heidelberg.

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Section: Fig 5 Presents Cyclic Chronovoltammetric Curves Recorded Insupporting

confidence: 78%

Section: Kinetic Measurementsmentioning

confidence: 99%

Section: Fig 5 Presents Cyclic Chronovoltammetric Curves Recorded Inmentioning

confidence: 99%

Section: Fig 5 Presents Cyclic Chronovoltammetric Curves Recorded Inmentioning

confidence: 99%

See 2 more Smart Citations

Catalytic activity of thiourea and its selected derivatives on electroreduction of In(III) in chlorates(VII)

Nosal‐Wiercińska

2010

Open Chemistry

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“…Such changes of E 0 f values with the increase of CE or CY concentration suggest that in the solution the stable Bi(III)-CE or Bi(III)-CY complexes do not appear. A similar effect was observed for In(III) and 1 mol dm À3 chlorates (VII) in the presence of growing concentrations of thiourea and its selected derivatives [34,35] and for Bi(III) ions electroreduction in the presence of methionine in the chlorate (VII) solutions with high water activity [16].…”

Section: Kinetic Measurementssupporting

confidence: 59%

The catalytic activity of cysteine and cystine on the electroreduction of Bi(III) ions

Nosal‐Wiercińska

2011

Journal of Electroanalytical Chemistry

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“Cap‐Pair” Effect as the Reason of the Catalytic Properties of Nicotinic Acid: Experimental and Theoretical Studies

Nieszporek

2022

ChemPhysChem

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The influence of nicotinic acid (NC) on the kinetics and the mechanism of electroreduction of Zn2+ ions in the acetate buffer (pH=6.0) was investigated using electrochemical methods (EIS, CV, SWV and DC). It was shown that the anions of NC catalyze the electrode reaction (cap‐pair effect) by adsorbing on the surface of the mercury electrode. The catalytic activity of NC is due to its ability to form active NC−Zn2+ complexes on the electrode surface, facilitating the electron transfer process. However, no evidence of the formation of such complexes in the solution was found using classical molecular dynamics. Moreover, it was proved that the electroreduction of Zn2+ ions in the presence of NC is a two‐stage process. The first stage involves the transfer of the first electron, preceded by the partial loss of the hydration shell by the Zn2+ ions and formation of the active complex. Moreover, it was shown that in the range of lower concentrations, c≤1.10−2 mol.dm−3, the nicotinic acid shows weaker catalytic abilities than another form of vitamin B3 – nicotinamide. In the range of its higher concentrations, the nicotinic acid is a more effective catalyst for the electroreduction of Zn2+ ions.

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Studies of the Effect of Thiourea on the Electroreduction of In(III) Ions in Perchloric Acid

Cited by 18 publications

References 18 publications

Catalytic activity of thiourea and its selected derivatives on electroreduction of In(III) in chlorates(VII)

Catalytic activity of thiourea and its selected derivatives on electroreduction of In(III) in chlorates(VII)

The catalytic activity of cysteine and cystine on the electroreduction of Bi(III) ions

“Cap‐Pair” Effect as the Reason of the Catalytic Properties of Nicotinic Acid: Experimental and Theoretical Studies

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