Pressure-Dependent Formation and Decomposition of Thiourea Hydrates
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https://figshare.com/articles/dataset/Pressure_Dependent_Formation_and_Decomposition_of_Thiourea_Hydrates/2456278
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资源简介：
High pressure can favor the formation of either thiourea
hydrates
or anhydrates. Above 0.60 GPa thiourea crystallizes as monohydrate
(NH2)2CS·H2O, while only anhydrous
thiourea is obtained from aqueous solution at normal conditions. At
0.70 GPa another hydrate, 3(NH2)2CS·2H2O, is formed, but above 1.20 GPa anhydrous thiourea becomes
stable again. The single crystals of both hydrates were grown in situ
in a diamond-anvil cell and their structures were determined by X-ray
diffraction. The structural factors favoring the formation of hydrates
above 0.6 GPa involve new types of hydrogen bonds to water molecules
and the more efficient molecular packing. The crystallization of thiourea
anhydrate above 1.20 GPa coincides with the stability region of ice
VI.
创建时间：
2013-01-02
