Fundamental studies regarding synergism between calix[4]arene-bis(tert-octylbenzo-crown-6) and alcohol modifiers in the solvent extraction of cesium nitrate

Lætitia H. Delmau, Thomas J. Lefranc, Peter V. Bonnesen, Jeffrey C. Bryan, Derek J. Presley, Bruce A. Moyer

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

This work emphasizes the crucial role of polar solvating molecules known as phase modifiers in solvent-extraction systems. The focus of these studies was the extraction of cesium by calix[4]arene-bis(tert-octylbenzo-crown-6) in dodecane modified with various lipophilic alcohols. Results of equilibrium modeling are consistent with aggregation of the alcohol molecules with each other and with the calixarene-cesium nitrate complexes. These modeling results are supported by electrospray mass spectrometry experiments, clearly showing the alcohol:anion adducts containing several alcohol molecules. They are also supported by crystallographic evidence showing the existence of a hexameric aggregate in the solid state for a derivative of one of the alcohol modifiers used for solvent extraction, in agreement with the species giving the best modeling results.

Original languageEnglish
Pages (from-to)23-57
Number of pages35
JournalSolvent Extraction and Ion Exchange
Volume23
Issue number1
DOIs
StatePublished - Jan 2005

Funding

This research was sponsored by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, U.S. Department of Energy, under contract number DE-AC05-00OR22725 with Oak Ridge National Laboratory, managed and operated by UT-Battelle, LLC. The authors thank Dr. Gary J. Van Berkel for assistance with electrospray mass spectrometry.

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