The formation of a crystalline complex of 18-crown-6 with water has been shown for the first time by Raman spectroscopy; the Raman spectral observations, incorporated with the measurement of the liquidus, lead to a phase diagram of this binary system, indicating that the molar ratio of 18-crown-6 to water in the complex is approximately 1 : 4–6.
H. Matsuura, K. Fukuhara, K. Ikeda and M. Tachikake, J. Chem. Soc., Chem. Commun., 1989, 1814 DOI: 10.1039/C39890001814
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