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E. Makrlík

Extraction of Sodium Picrate from Water into Nitrobenzene in the Presence of Dibenzo-21-Crown-7

From extraction experiments with ²²Na as a tracer, the extraction constant corresponding to the equilibrium Na⁺(aq) + A⁻(aq) + L(nb) ⇔ NaL⁺(nb) + A⁻(nb) taking place in the two-phase water–nitrobenzene system (A⁻ = picrate, L = dibenzo-21-crown-7; aq = aqueous phase, nb = nitrobenzene phase) was evaluated as logK_ex(NaL⁺,A⁻) = 1.9±0.1. Further, the stability constant of the dibenzo-21-crown-7-sodium complex in nitrobenzene saturated with water was calculated for a temperature of 25 °C logβ_nb(NaL⁺) = 7.1±0.1.

Zeitschrift für Physikalische Chemie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0942-9352
Volume: 218, 07/2004
Pages: 887 - 891

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