Abstract
Cylindrical calix[4]- bis-cryptand, calix[4]arene incorporating one diaza-tetraoxa-macrocyclic [18]-N 2O 4 subunit on each side of 1,3-alternate calix[4]arene framework, has been synthesized. The complexations of some alkali and ammonium cations by this macropentacycle have been studied by means of proton nuclear magnetic resonance spectroscopy.
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