Abstract
1,3-Calix[4]-bis-crowns are ditopic receptors able to form 1:1 and 1:2 complexes with alkali and ammonium cations. X-ray structures of the Cs+ complexes showed the 1,3-Calix[4]-bis-crown-6 to be highly preorganized prior to complexation. They showed very high Cs+/Na+ selectivity which allowed their used in the removal of cesium from radioactive wasted waters. Cation-tunneling has been evidenced through the cavity of the calixarene unit with 1,3-calix[4]-bis-crown-5. It is also presented the synthesis and complexation properties of 1,3-calix[4]-bis-aza-oxacrowns and 1,3-Calix[4]-bis-cryptands.
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© 1998 Springer Science+Business Media Dordrecht
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Asfari, Z. et al. (1998). Calix[4]-bis-Crowns: From Nuclear Waste Treatment to Molecular Machines. In: Coleman, A.W. (eds) Molecular Recognition and Inclusion. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5288-4_20
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DOI: https://doi.org/10.1007/978-94-011-5288-4_20
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