Abstract
A double clathrate hydrate with the composition THF·0.5(n-Pr)4NF·16H2O and cubic structure II (CS-II,a=17.67 A) has been obtained. Its experimental density is 1.053±0.001 g/cm3; its melting point is 8.1°C, i.e. 3.1°C higher than that of the THF·17H2O hydrate. The double hydrates of acetone, 1,4-dioxan, trimethyleneoxide and 1,3-dioxolane with (n-Pr)4NF have melting points of −14.8, −5.5, −2.6 and −9.6°C, respectively. With pressure increase up to 6 kbar the melting points of the double hydrates increase monotonously in contrast to common CS-II hydrates. The friability of the structure of the hydrates (the packing coefficient) and their sensitivity to pressure (dT/dP) are compared.
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