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Direct Measure of the Hydration Number of Aqueous Methane

Center for Research on Hydrates, Department of Chemical Engineering, Colorado School of Mines, Golden, Colorado 80401
J. Am. Chem. Soc., 2006, 128 (2), pp 414–415
DOI: 10.1021/ja055283f
Publication Date (Web): December 15, 2005
Copyright © 2006 American Chemical Society

Abstract

Abstract Image

A hydration number of 20 has been measured for aqueous CH4 in the temperature range 273−298 K on the basis of the simultaneous observation of the 13C isotropic resonance lines of CH4 in both aqueous solution and the dodecahedral cage of CH4 structure I hydrate. Additional experimental evidence and analysis reported in this paper suggest that the dominant aqueous hydration number of methane is 20.

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