Interactions of Ions and Ion Pairs with Crown Ethers and Their Polymers
- 1 August 1973
- journal article
- research article
- Published by Taylor & Francis in Journal of Macromolecular Science: Part A - Chemistry
- Vol. 7 (5), 1015-1033
- https://doi.org/10.1080/10601327308060479
Abstract
The interactions of ions and ion pairs with crown ethers (macrocyclic polyethers) and their vinyl polymers were studied in aqueous and non aqueous media by using optical spectroscopy, distribution equilibria, conductance, and viscosity. The polymers, poly(vinylbenzo-15-crown-5) and poly(vinylbenzo-18-crown-6), were found to be considerably more efficient than their monomeric analogs in binding those cations which have diameters larger than that of the crown cavity and which tend to form 2:1 crowncation complexes. The stoichiometries of the complexes were determined by spectroscopy for fluorenyl ion pair salts in ethereal solvents and by conductance for inorganic salts in solvents such as acetone. The viscosity behavior of the polymers in the presence of salts resembles that of poly electrolytes, with the reduced viscosity being strongly enhanced at low polymer-salt concentrations.Keywords
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