Abstract
The competitive solvent extractions of alkali and alkaline earth metals by di-ionizable calix[4]arene nanobaskets were studied using nine conformers of calix[4]arene nano-baskets. The objective of this work is to assess the variation of macrocycle conformation, orientation and position of pendant moieties upon the extraction parameters (efficiency, selectivity and pH1/2) of the complexes. The results revealed that alternation of ring conformation in calixarene scaffold affects the solvent extraction parameters towards alkali and alkaline earth metals, while changing the orientation of pendant moieties from orthoto paraas well as cisto transanalogues depicted no changes in those extraction parameters.
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