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Volumn 43, Issue 24, 2004, Pages 7617-7621

Selective solid-liquid extraction of lithium halide salts using a ditopic macrobicyclic receptor

Author keywords

[No Author keywords available]

Indexed keywords

BROMINE DERIVATIVE; HALIDE; LITHIUM; LITHIUM CHLORIDE; POTASSIUM CHLORIDE; RECEPTOR SUBTYPE; SODIUM CHLORIDE;

EID: 9444277816     PISSN: 00201669     EISSN: None     Source Type: Journal    
DOI: 10.1021/ic049066b     Document Type: Article
Times cited : (112)

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    • (2004) Chem. Commun. , pp. 1352-1353
    • Turner, D.R.1    Spencer, E.C.2    Howard, J.A.K.3    Tocher, D.A.4    Steed, J.W.5
  • 12
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    • Examples of solid-liquid extraction of lithium salts with weakly competitive counteranions include the following: Inokuma, S.; Takezawa, M.; Satoh, H.; Nakamura, Y.; Sasaki, T.; Nishimura, J. J. Org. Chem. 1998, 63, 5791-5796. Inokuma, S.; Yamamoto, T.; Nishimura, J. J. Org. Chem. 1990, 31, 97-100. Nishizawa, K.; Takano, T.; Ikeda, I.; Okahara, M. Sep. Sci. Technol. 1988, 23, 333-343.
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    • The unit cell in the [1·LiBr] crystal contains four independent but structurally similar complexes.
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    • note
    • 3 are all less than 0.02 mg/mL.
  • 34
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    • note
    • Excellent lithium salt solubility is often seen when the solvent contains a polar aprotic additive (such as TMEDA or HMPA) that can coordinate to the lithium and produce solvated ion-pair aggregates with an ionic core and an organic periphery.
  • 35
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    • note
    • A property that in many ways is analogous to hydration energy is the salt lattice energy, which in the case of chloride salts is LiCl (834 kJ/mol) > NaCl (769 kJ/mol) > KCl (701 kJ/mol) > CsCl (657 kJ/ mol). However, this property does not correlate with solubility of the solid salt in an organic solvent.
  • 36
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    • note
    • Receptor 1 appears to bind the sodium and potassium salts in solution as contact ion pairs and most likely binds the lithium salts as water-separated ion pairs (as illustrated in Figures 1 and 2), where the water is derived adventitiously from the atmosphere. The question arises whether receptor 1 can bind the lithium salts in extremely anhydrous solution as contact ion pairs; however, this is a technically difficult experiment to conduct in an unambiguous manner and was not attempted.
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    • note
    • It is possible that receptor 1 accelerates the solubilization process by removing associated ion pairs directly from the solid surface.
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    • see ref 2 and references therein
    • a values; however, the literature data (see ref 2 and references therein) strongly suggest that receptor 1 does not have a selective affinity for lithium salts over sodium or potassium salts.
  • 39
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    • Several ditopic receptors that likely bind salts as separated ion pairs have been reported to be poor solubilizers of solid alkali metal chlorides: Webber, P. R. A.; Beer, P. D. Dalton Trans. 2003, 2249-2252. Evans, A. J.; Beer, P. D. Dalton Trans. 2003, 4451-4456. Tumcharern, G.; Tuntulani, T.; Coles, S. J.; Hursthouse, M. B.; Kilburn, J. D. Org. Lett. 2003, 5, 4971-4974.
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    • Several ditopic receptors that likely bind salts as separated ion pairs have been reported to be poor solubilizers of solid alkali metal chlorides: Webber, P. R. A.; Beer, P. D. Dalton Trans. 2003, 2249-2252. Evans, A. J.; Beer, P. D. Dalton Trans. 2003, 4451-4456. Tumcharern, G.; Tuntulani, T.; Coles, S. J.; Hursthouse, M. B.; Kilburn, J. D. Org. Lett. 2003, 5, 4971-4974.
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    • Several ditopic receptors that likely bind salts as separated ion pairs have been reported to be poor solubilizers of solid alkali metal chlorides: Webber, P. R. A.; Beer, P. D. Dalton Trans. 2003, 2249-2252. Evans, A. J.; Beer, P. D. Dalton Trans. 2003, 4451-4456. Tumcharern, G.; Tuntulani, T.; Coles, S. J.; Hursthouse, M. B.; Kilburn, J. D. Org. Lett. 2003, 5, 4971-4974.
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