Naderi, M., Dale, J.A., Parkes, Gareth M.B and Brown, D.R. (2002) Solvation of exchangeable cations in sulfonated polystyrene ion-exchange resins: an ESR study. Reactive and Functional Polymers, 51 (1). p. 25. ISSN 1381-5148

The solvation of Cu2+ ions in sulfonated poly(styrene–co-divinylbenzene) ion-exchange resins has been studied by electron spin resonance (ESR) spectroscopy. The ESR spectrum of Cu2+ 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 Cu2+ ions. In resins fully solvated with methanol, the ESR spectrum is characteristic of the unconstrained, fully solvated Cu2+ ion and, again, on drying, loss of solvent occurs without the formation of any well-defined Cu2+ centres. Similar behaviour is seen for resins solvated with i-propanol and n-butanol.

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