Abstract
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.
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