Solvation of exchangeable cations in sulfonated polystyrene ion-exchange resins: an ESR study

The solvation of Cu 2+ ions in sulfonated poly(styrene–co-divinylbenzene) ion-exchange resins has been studied by electron spin resonance (ESR) spectroscopy. The ESR spectrum of Cu 2+ ions in hydrated resins is characteristic of the freely tumbling hexahydrated cation. On dehydration of the gel, the...

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Bibliographic Details
Published in:Reactive & functional polymers 2002-04, Vol.51 (1), p.25-31
Main Authors: Naderi, M, Dale, J.A, Parkes, G.M.B, Brown, D.R
Format: Article
Language:English
Subjects:
Applied sciences
Copper
ESR
Exact sciences and technology
Exchange resins and membranes
Forms of application and semi-finished materials
Ion-exchange resin
Polymer industry, paints, wood
Solvation
Sulfonated polystyrene
Technology of polymers
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Summary:The solvation of Cu 2+ ions in sulfonated poly(styrene–co-divinylbenzene) ion-exchange resins has been studied by electron spin resonance (ESR) spectroscopy. The ESR spectrum of Cu 2+ ions in hydrated resins is characteristic of the freely tumbling hexahydrated cation. On dehydration of the gel, the spectrum gradually broadens suggesting that dehydration occurs in a relatively disordered way. Reversible loss of ESR signal intensity is attributed to dipolar interactions between neighbouring Cu 2+ ions. In resins fully solvated with methanol, the ESR spectrum is characteristic of the unconstrained, fully solvated Cu 2+ ion and, again, on drying, loss of solvent occurs without the formation of any well-defined Cu 2+ centres. Similar behaviour is seen for resins solvated with i-propanol and n-butanol.
ISSN:1381-5148
DOI:10.1016/S1381-5148(02)00026-3