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13C Magic-Angle Spinning Nuclear Magnetic Resonance
Clathrate hydrates crystallize into different structures as function of the guest molecule. Some properties of these compounds, as well as their stability and kinetic behavior are function of the hydrate structure present. 13C magic-angle spinning (MAS) NMR spectra obtained as a function of time permit not only the assignment of the hydrate structure, but also to determine the quantitative distribution of the gas guests in the different cavities of the hydrate structure during dissociation. At the Center for Hydrate Research, 13C MAS NMR spectroscopy is used to provide molecular-scale experimental information on the formation and dissociation mechanisms of the gas hydrates.
All 13C MAS NMR spectra are acquired with a Chemagnetics CMX Infinity 400 NMR spectrometer operating at a frequency of 100.5 MHz for 13C. Proton decoupling fields of 50 kHz and MAS speeds of about 3 kHz are used.
