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- W1998461312 abstract "Abstract Calix-bis(benzocrown-6) 6 and 7 were converted into the water-soluble receptors 9 , 10 , 12 and 15 by introducing hydroxy, carboxy, sulfato or diethanolamino groups at the para position of the phenolic ring and/or on the benzo-ether moieties. The complexation properties of these ionophores were studied for all alkali cations in methanolic and aqueous media. Stability constants were calculated by UV–Vis spectroscopy. All ligands showed a more or less affinity for the larger cations, depending on the nature and the position of the substituents grafted on the benzo-ether chain only or both on the calixarene ring and the benzo-ether loop. For selective Cs+/Na+ separation, the efficiency of the ligands was evaluated by means of a nanofiltration system. In comparison with the known tetrahydroxylated bis-crown-6 calix[4]arene 1 , compounds 9 , 12 and 15 represent the most selective ligands for the Cs+ cation in a moderate salted medium ([NaNO3]=85 g/L)." @default.
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- W1998461312 date "2003-12-01" @default.
- W1998461312 modified "2023-09-26" @default.
- W1998461312 title "New water-soluble calix[4]arene-bis(benzocrown-6) for caesium–sodium separation by nanofiltration–complexation" @default.
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- W1998461312 doi "https://doi.org/10.1016/j.tet.2003.10.051" @default.
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