The “Picrate Effect” on Extraction Selectivities of Aromatic Group-Containing Crown Ethers for Alkali Metal Cations1

…, RE Hanes, HS Hwang, RA Bartsch…

Index: Talanova, Galina G.; Elkarim, Nazar S. A.; Hanes Jr., Robert E.; Hwang, Hong-Sik; Rogers, Robin D.; Bartsch, Richard A. Analytical Chemistry, 1999 , vol. 71, # 3 p. 672 - 677

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Citation Number: 56

Abstract

As evaluated with 15 crown ethers which contain varying numbers of benzo substituents, the magnitude of the extraction selectivities (and in one case, the selectivity order) of aromatic group-containing ionophores for alkali metal picrates may vary significantly from those for alkali metal salts with inorganic anions as a result of π-π interactions between picrate ion and an aromatic unit of the ionophore. The importance of the “picrate effect” increases as ...