Abstract
With low and and high power transient methods we have found line width narrowing of the ν0 signal of HMT that contains small amounts of water at 298 K. Samples were prepared by humidifying to moistures between 0% and 28% by weight. A minimum line width was observed around HMT : 1 H2O and is likely due to reduced dipole-dipole interactions arising from a 6.4% increase in the cell dimensions. This would account for a narrowing of 140 Hz and when offset by 50 Hz from broadening due to a smaller T1 yields the experimental minimum line width. The smaller T1 also indicates a reduction in the C3 rotation barrier of 2.2 kJ/mole. The v+ and v- lines corresponding to H bonded nitrogen were found but the v0 corresponding to the R3m structure of HMT: 6 H2O was not observed. The v0- of dry HMT was seen with all samples. This implies that humidified HMT has a predominate 143 m crystal structure. When more than 1 H2O per HMT was present the v0 line width was broadened in proportion. This is indicative of a non-uniform H2O distribution within the lattice.
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