Potassium, rubidium, caesium, and mixed alkali metals dissolve in the liquid crown ether, 1,4,7,10,13-pentaoxa-cyclopentadecane (15-crown-5), to give intensely coloured solutions; spectroscopic studies (optical, e.s.r., and n.m.r.) revealed alkali metal anions, solvated electrons, and various cation–electron aggregates in these systems.
A. Ellaboudy, D. M. Holton, R. N. Edmonds and P. P. Edwards, J. Chem. Soc., Chem. Commun., 1986, 1444 DOI: 10.1039/C39860001444
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