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From extraction experiments with  22 Na 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 log K  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 log  β  nb (NaL + ) = 7.1±0.1.

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