Polarographisches Verhalten einiger Chromkomplexe I. Hexarhodanochromat(III)-ion

Fischerová, E; Fischer, Ö.

doi:10.1135/cccc19612570

Cited by 14 publications

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“…An anomaly at negative potentials ( À 1.5 V) can be ascribed to a combined kinetic ( Fig. 2D, b) and diffusion controlled process caused by the reduction of Cr(II) to Cr(0) [33]. When DTPA (also 0.1 mmol L À1 ) is added to the solution of Cr(III) in acetate buffer this peak at À 1.5V is shifted to a more negative potential range than examined.…”

Section: Cr(iii) As the Initial Species In Solutionsupporting

confidence: 91%

“…where v means the scan rate in V s À1 and the result DE p is the potential difference in mV between the anodic E p a and cathodic E p c peak potentials. In [33] the irreversibility of the redox reaction of the Cr(III)/Cr(II) pair in its hexa-rhodano complex is explained by the impact of the population of the e g -orbital on the character of the complexes.…”

Section: Cr(iii) As the Initial Species In Solutionmentioning

confidence: 93%

“…In [33] the irreversibility of the redox reaction of the Cr(III)/Cr(II) pair in its hexa-rhodano complex is explained by the impact of the population of the e g -orbital on the character of the complexes.…”

Section: Cr(iii) As the Initial Species In Solutionmentioning

confidence: 98%

mentioning

confidence: 96%

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Study of the Complexation, Adsorption and Electrode Reaction Mechanisms of Chromium(VI) and (III) with DTPA Under Adsorptive Stripping Voltammetric Conditions

2003

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The complexation of Cr(III) and Cr(VI) with diethylenetriaminepentaacetic acid (DTPA), the redox behavior of these complexes and their adsorption on the mercury electrode surface were investigated by a combination of electrochemical techniques and UV/vis spectroscopy. A homogenous two-step reaction was observed when mixing Cr(III), present as hexaquo complex, with DTPA. The first reaction product, the electroactive 1 : 1 complex, turns into an electroinactive form in the second step. The results indicate that the second reaction product is presumably a 1 : 2 Cr(III)/DTPA complex. The electroreduction of the DTPA-Cr(III) complex to Cr(II) was found to be diffusion rather than adsorption controlled.The Cr(III) ion, generated in-situ from Cr(VI) at the mercury electrode at about À 50 mV (vs. Ag j AgCl) (3 mol L À1 KCl), was found to form instantly an electroactive and adsorbable complex with DTPA. By means of electrocapillary measurements its surface activity was shown to be 30 times higher than that of the complex built by homogenous reaction of DTPA with the hydrated Cr(III). Both components, DTPA and the in-situ built complex Cr(III) ion were found to adsorb on the mercury electrode.The effect of nitrate, used as catalytic oxidant in the voltammetric determination method, on the complexation reaction and on the adsorption processes was found to be negligible.The proposed complex structures and an overall reaction scheme are shown.

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Section: Cr(iii) As the Initial Species In Solutionsupporting

confidence: 91%

Section: Cr(iii) As the Initial Species In Solutionmentioning

confidence: 93%

Section: Cr(iii) As the Initial Species In Solutionmentioning

confidence: 98%

mentioning

confidence: 96%

See 2 more Smart Citations

Study of the Complexation, Adsorption and Electrode Reaction Mechanisms of Chromium(VI) and (III) with DTPA Under Adsorptive Stripping Voltammetric Conditions

2003

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“…Âaeå äàâíî áóëî âñòàíîâëåíî, ùî ÿê íà ðòóòíîìó êðàïàþ÷îìó åëåêòðîä³, òàê ³ íà òâåðäèõ åëåêòðîäàõ åëåêòðîâ³äíîâëåííÿ ³îí³â Cr(III) ïðîõîäèòü ñòóï³í÷àñòî ÷åðåç ñòàä³þ óòâîðåííÿ ³íòåð-ìåä³àò³â -êîìïëåêñíèõ ³îí³â Cr(II) [36,[41][42][43][44][45]. Òàê, íàïðèêëàä, ùå â 1929 ðîö³ áóëî ïîêàçàíî [41], ùî ïðè åëåêòðîâ³äíîâëåíí³ ³îí³â Cr(III) íà ïîëÿðîãðàì³ ñïîñòåð³ãàþòüñÿ äâ³ õâèë³ ñòðóìó, ùî äîáðå â³äîêðåìëåí³ îäíà â³ä îäíî¿ ³ â³äïîâ³äàþòü íàñòóïí³é ðåàêö³éí³é ñõåì³ ñòóï³í÷àñòîãî ðîçðÿäó:…”

Section: ê³íåòè÷í³ çàêîíîì³ðíîñò³ òà ìåõàí³çì êàòîäíîãî ïðîöåñó ïðè åunclassified

Chromium electrodeposition using electrolytes based on trivalent chromium compounds: a review

Данилов¹,

Protsenko²

2020

VKhKhT

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Elektrokatalyse in der Organoübergangsmetallchemie

Astruc

1988

Angewandte Chemie

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Professor Jean Tiroujlet gewidmetSeit 1980 hat sich parallel zur organischen Elektrokatalyse die Anwendung der Elektrokatalyse auf Reaktionen der Organoiibergangsmetallverbindungen explosionsartig entwickelt. Seit Feldberg 197 I die theoretischen und experimentellen Grundlagen erarbeitet hatte (ECE-Mechanismus), wurde die Elektrokatalyse dank schneller elektrochemischer Techniken auf eine Reihe von Organometallreaktionen, wie Isomerisierung, Ligandenaustausch, Chelatisierung, Zersetzung, CO-Insertion und -Eliminierung, angewendet. Meistens wurden bisher entweder mit oxidierenden Agentien (oder einer Anode) gestartete Austauschreaktionen von N-Donor-gegen P-Donorliganden in einkernigen Verbindungen oder der durch reduzierende Agentien (oder eine Kathode) gestartete Austausch von CO-Liganden gegen P-Donorliganden in Clustermolekulen untersucht. Die praparativen Aspekte der Elektrokatalyse haben sich in der Clusterchemie erstaunlich entwickelt, und es deutet alles darauf hin, da8 es sich hier um eine sehr niitzliche Technik handelt. In dieser Ubersicht werden zunachst das Prinzip und die Charakteristika der Elektrokatalyse in der Organoiibergangsmetallchemie herausgearbeitet. Daran anschliefiend werden die verfiigbaren effizienten Starterreagentien vorgestellt und die bisher untersuchten Systeme beschrieben. Die Betonung liegt dabei auf dem Vergleich zwischen Oxidation und Reduktion als Startreaktion, ihrem EinfluB auf die Lange des Elektrokatalysecyclus und auf die ,,Coulomb-Ausbeute" sowie dem Dualismus Elektrochemie/Redoxreagentien.

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Polarographisches Verhalten einiger Chromkomplexe I. Hexarhodanochromat(III)-ion

Cited by 14 publications

References 0 publications

Study of the Complexation, Adsorption and Electrode Reaction Mechanisms of Chromium(VI) and (III) with DTPA Under Adsorptive Stripping Voltammetric Conditions

Study of the Complexation, Adsorption and Electrode Reaction Mechanisms of Chromium(VI) and (III) with DTPA Under Adsorptive Stripping Voltammetric Conditions

Chromium electrodeposition using electrolytes based on trivalent chromium compounds: a review

Elektrokatalyse in der Organoübergangsmetallchemie

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