19 F N.m.r. spectra of solutions of KF–18-crown-6 in a variety of organic solvents show ca. 6kHz line widths essentially indistinguishable from those of solid KF suggesting tight ion pairs or higher aggregates in solution.
J. M. Miller and J. H. Clark, J. Chem. Soc., Chem. Commun., 1982, 1318 DOI: 10.1039/C39820001318
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