Summary
The extractions of cobalt(II) from 1M (Na, H)ClO4 medium with mixtures of 4-acylpyrazol-5-ols (HL) (17 species) and aliquat 336 in its perchlorate form (B +, ClO4 −) in toluene, at 25°C, have been studied. They are described by the equilibrium:
Its constant is partly determined by the anionic exchange equilibrium between\(\overline {(B^ + ,ClO_4 ^-- )} \) and\(\overline {(B^ + ,ClO_4 ^-- )} \), which is favoured when HL substitutents are electron-attractive. Lipophilic substituents on HL favour the cobalt extraction, but conflicting effects can occur owing, for example, to steric hindrance.
Zusammenfassung
Es wurde die Extraktion von Kobalt(II) aus 1M (Na, H)ClO4-Medium mit Mischungen von 4-Acyl-pyrazol-5-olen (HL, 17 verschiedene Verbindungen) und Aliquat 336 in seiner Perchlorat-Form (B +, ClO4 −) bei 25°C in Toluol untersucht. Es gilt folgendes Gleichgewicht:
Die Gleichgewichtskonstante ist teilweise vom anionischen Austauschgleichgewicht zwischen\(\overline {(B^ + ,ClO_4 ^-- )} \) und\(\overline {(B^ + ,ClO_4 ^-- )} \) bestimmt, das bevorzugt wird, wenn die Substituenten an HL elektronenanziehend sind. Lipophile Substituenten an HL sind für die Extraktion von Kobalt vorteilhaft, es können jedoch dabei auch gegenläufige sterische Hinderungseffekte auftreten.
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Lakkis, M., Lakkis, Z., Goetz-Grandmont, G.J. et al. Extraction of cobalt(II) with mixtures of 4-acyl-pyrazol-5-ols and aliquat 336 in toluene: Effect of the pyrazolol substituents. Monatsh Chem 122, 9–15 (1991). https://doi.org/10.1007/BF00815156
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DOI: https://doi.org/10.1007/BF00815156