Acceleration of electrode processes by organic compounds — “cap-pair” effect

Sykut, K.; Dalmata, Grażyna; Nowicka, Barbara; Saba, Jadwiga

doi:10.1016/s0022-0728(78)80065-5

Cited by 53 publications

(25 citation statements)

References 13 publications

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“…The electroreduction of In(III) ions in non-complexing solutions of electrolytes is an irreversible process. The electroreduction rate can be increased by adding organic substances fulfilling the conditions of the cappair rule to the supporting electrolyte [32].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…The presented results allow for the following conclusions: -cystine, in accordance with cap -pair rule (Sykut 1978) (Dalmata 2005), accelerates the electroreduction of Bi(III) ions in chlorates (VII) solutions -the reversibility of Bi(III) ions electroreduction in chlorates (VII) depends on the cystine concentration and water activity -the optimal concentration of cystine and water activity for Bi(III) determination by voltammetric method were established. The presented method is fast, simple, relatively inexpensive and with easily accessible measurement system.…”

Section: Resultsmentioning

confidence: 55%

“…In agreement with cap -pair effect (Sykut 1978) (Dalmata 2005) the organic substances introduced to the supporting electrolyte can catalyze one type of electrode processes and simultaneously have no influence or even inhibit the other electrode processes. Such behaviour enables the determination of different elements near each other without necessity of analyte accumulation, what considerably simplifies the analysis procedure.…”

Section: Introductionmentioning

confidence: 66%

Selective, Simple and Economical Method for the Voltammetric Determination of Bi(III) in the presence Cystine in Non – Complexing Solution

Wiercińska

Grochowski

Tyszczuk‐Rotko

et al. 2013

E3S Web of Conferences

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Abstract. The simple and fast method for the determination of Bi(III) in non-complexing solution was proposed. The catalytic activity of cystine on Bi(III) ions electroreduction process were utilized. The calibration graph of Bi(III) in 4 mol·dm -3 chlorate (VII) in the presence of 1·10 -2 mol·dm -3 cystine is linear in the range of concentrations of Bi(III) from 7·10 -7 to 4·10 -5 mol·dm -3 . The detection and quantification limits were found to be 1.2·10 -7 mol·dm -3 and 4.02·10 -7 mol·dm -3 , respectively. Precision and recovery of the method were investigated by determination of Bi(III).

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“…ir-electron interaction between adsorbed molecules and the electrode surface has a characteristic influence on the adsorption behavior of organic substances (10), and specific interactions between the analyte and some other molecule or ion within the double layer may also be helpful in identification (11,12). Some adsorbed organics will inhibit the reduction of metal ions, while others, througn the so called "cap-pair" effect will accelerate reductions (13).…”

Section: Resultsmentioning

confidence: 99%

Coping with the Information Explosion Provided by Modern Chemical Instrumentation

Perone

1984

ACS Symposium Series

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Acceleration of electrode processes by organic compounds — “cap-pair” effect

Cited by 53 publications

References 13 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)

Selective, Simple and Economical Method for the Voltammetric Determination of Bi(III) in the presence Cystine in Non – Complexing Solution

Coping with the Information Explosion Provided by Modern Chemical Instrumentation

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