On the basis of irreversible polarographic waves obtained for free iron(H) and its oxalate complexes, the values of #Is and B8 are calculated. The results are compared with those reported by other authors. R&unG--On a base le calcul des valeurs pz et ps sur les potentiels de demi-onde des vagues poi
Evaluation of stability constants of complexes from irreversible polarographic waves
✍ Scribed by J. Biernat; M. Baranowska-Żrałko
- Book ID
- 103062276
- Publisher
- Elsevier Science
- Year
- 1972
- Tongue
- English
- Weight
- 705 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
Ah&act
-A general equation of the totally irreversible complex reduction polarographic wave is derived by a simple method. The partial derivatives of this equation (at constant l&and concentration, constant potential and constant relative current) are useful for determination of the electrode mechanism. The mechanism developed considerably simplifies the general equation. A possibility of obtaining the values of complexation constants from the half-wave potential differences for two main types of electrode mechanism is discussed. The effect of the 1y3 potential in the electrode double layer is also discussed. R&mm&L'&quation g6n&aIe de la vague polarogaphi ue totafement irr&ersible de la reduction des complexes 6tB obtenue d'une fawn simple. Les 5 d r&es partielles de cette 6quation (avec la concentration de ligand constant, le potentiel constant et le courant relatif constant) sont utilids pour la d&e rmination du m&anisme de la &action propre sur l'&ctrode. La connaissance de ce m&r&me simpltie 1'Cquation g&&ale. On discute la possibilite de I'obtention des valeurs de constantes de complexation d'apr&s les diff&ences du potentiei de den&onde pour les deux types principeaux de m6canisme sur &ctrode. On discute aussi l'effet du potentiel de la double couche de l'&ctrode, rp,. zusammencasSnng-Es wurde eine aligemeine Gleichung fiir die polarographischen Stufe der vijllig irreversiblen Reduktion lab&r Komplexe in einfacher Weise abgeleitet. Die Bestimmung des Elektrodenrnechanismus wird durch die Werte der partielfen Ableitungen erleichtert. Es wurden die M&glichkeiten der Berechnung der StabiIit&konstanten aus den Diff erenzen der Halbstufenpotentiale ftir zwei Haupttypen des EIektrodenmechanismus diskutiert. Der Einfluss des pI Potentials des diffusen Teils der Doppelschicht wurde such eriirtert.
📜 SIMILAR VOLUMES
A general method for determination of the stability constants of complexes of crown ethers and related compounds with small organic molecules in polar solvents is described, based on an indirect polarographic procedure. Computerized evaluation of the data forms an essential part of the procedure.