Direct Measure of the Hydration Number of Aqueous Methane

• Published in: Journal of the American Chemical Society Vol. 128; no. 2; pp. 414 - 415
• Main Authors: Dec, Steven F, Bowler, Kristin E, Stadterman, Laura L, Koh, Carolyn A, Sloan, E. Dendy
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 18.01.2006
• Subjects: Chemical and knight shifts; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Magnetic resonances and relaxations in condensed matter, mössbauer effect; Molecular liquids; Nuclear magnetic resonance and relaxation; Physics; Structure of solids and liquids; crystallography; Studies of specific liquid structures; Methane; Solid state; Chemical shift; NMR parameter; Aqueous solutions; Solution structure; Hydrocarbons; Gas hydrates; Experimental study; Solubility limit; NMR spectroscopy; Carbon 13
• ISSN: 0002-7863; 1520-5126
• DOI: 10.1021/ja055283f

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.