Abstract
The theory is derived to determine the dimer-formation constant,K 2, of a crown ethermetal salt 1∶1∶1 complex in organic solvents of low dielectric constant by solvent extraction. The theoretical predictions are verified experimentally by extraction of sodium picrate (NaA) with 15-crown-5 (15C5) into carbon tetrachloride. All the experiments were conducted at 25°C. The logK 2 value of the Na(15C5)A complex in carbon tetrachloride has been determined to be 4.05±0.11. Moreover, the partition constant of the complex is calculated.
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[L] t 3.8×10−4−4.0×10−3 M; [Na] t 4.0×10−2 M; [HA] t (4.0−4.6)×10−3 M.
[L] t 4.1×10−3−1.4×10−2 M; [Na] t 4.0×10−2 M; [HA] t (4.0−4.6)×10−3 M.
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Takeda, Y., Takagi, C. Solvent extraction of sodium picrate with 15-crown-5 into carbon tetrachloride. The determination of the dimer-formation constant of a crown ether-univalent metal salt 1∶1∶1 complex. J Incl Phenom Macrocycl Chem 17, 93–97 (1994). https://doi.org/10.1007/BF00708003
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DOI: https://doi.org/10.1007/BF00708003