Study of complexation of Li, Na and K trichloroacetates in extraction systems with benzo-15-crown-5 ether and its lipophilic analog.

The extraction of Li, Na and K trichloroacetates with B15C5 and tPB15C5 in chloroform has been studied. The compounds of lithium, sodium and potassium trichloroacetates with B15C5 in crystalline form were isolated and characterized by X-ray diffraction and IR spectroscopy techniques. A significant transition of B15C5 into the equilibrium aqueous phase was established. It is shown that the use of its lipophilic analog helps to avoid this problem and leads to a significant increase in lithium extraction. [Display omitted] The extraction of Li, Na and K trichloroacetates by benzo-15-crown-5 ether and its lipophilic analog in chloroform has been studied. Extraction isotherms were obtained and the transition of extractants into the equilibrium aqueous phase was determined. The metal: crown ether ratios in the extracted compounds were determined by the slope analysis method. The thermodynamic extraction parameters of Li, Na and K trichloroacetates in systems with benzo-15-crown-5 ether (B15C5) and 3- tert -pentylbenzo-15-crown-5 ether (tPB15C5) were determined. The complexes [Li 3 (B15C5)(TCA) 3 ], [Na(B15C5)(TCA)] and [K(B15C5) 2 ](DCA)·H 2 O were isolated in crystalline form and characterized by IR spectroscopy and X-ray diffraction. [ABSTRACT FROM AUTHOR]