A new calix[4]arene-bis(crown ether) derivative displaying an improved caesium over sodium selectivity: molecular dynamics and experimental investigation of alkali-metal ion complexation
- 1 January 1999
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 2,p. 271-284
- https://doi.org/10.1039/a806714g
Abstract
In the light of computational studies suggesting enhanced cation-binding abilities for various benzo derivatives of calix[4]arene-bis-crown-6 macrocycles, the synthesis and properties of one of these ligands, BC6B2, have been investigated. In this compound, di(1,2-phenylene)-annelated glycolic chains link the 1,3- and 2,4-phenyl rings of the calixarene, thereby forcing it into the 1,3-alternate conformation. The detailed structures of BC6B2·CH3NO2 1 and Cs2(NO3)2BC6B2·CHCl3·H2O 2 have been established by X-ray crystallography. Studies of coordination and solvent extraction of the alkali-metal ions have been used to compare this ligand with a number of related systems known previously.Keywords
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