It is suggested that of the current models representing the diamagnetic species in metal–ammonia solutions, the (e22–)solv. or F′ model is the most satisfactory. Evidence for this postulate is drawn from a wide range of experimental data including optical studies, electron spin resonance and nuclear magnetic resonance spectroscopy, and from results for solutions of europium in liquid ammonia.
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Catterall et al. (1966) studied this question.