The overall extraction equilibrium constants (Kex) for 1:1:1 complexes of 15-crown-5 (15C5) and 18-crown-6 (18C6) with several univalent metal picrates between benzene and water have been determined at 25 °C. The Kex sequences of the univalent metal ion with 15C5 and 18C6 are Ag+>Na+>Tl+>>K+>Rb+>Cs+>Li+ and Tl+>K+>Rb+>Ag+>Cs+>Na+>>Li+ respectively. The Kex series for each same crown ether reflects the stability and the extractability of the univalent metal ion-crown ether complex in the aqueous phase. The Kex sequences for the 15C5 system depends entirely on the extractability of the univalent metal ion-crown ether complex. In the case of the 18C6 system this largely depends on the stability of the univalent metal ion-crown ether complex.
No takes yet. Share an insight, caveat, or question.
Takeda et al. (1979) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: