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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Editor-in-Chief: Rademann, Klaus

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Volume 218, Issue 7


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

E. Makrlík
Published Online: 2008-05-26 | DOI: https://doi.org/10.1524/zpch.218.7.887.35727


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 logKex(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 log βnb(NaL+) = 7.1±0.1.

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Published Online: 2008-05-26

Published in Print: 2004-07-01

Citation Information: Zeitschrift für Physikalische Chemie, Volume 218, Issue 7, Pages 887–891, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1524/zpch.218.7.887.35727.

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