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High-Pressure Transformations and the Resonance Structure of Thiourea
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2018-02-12 00:00:00 , DOI: 10.1021/acs.jpcc.8b00452
Hanna Tomkowiak 1 , Andrzej Katrusiak 1
Affiliation  

High pressure increases intermolecular interactions in the crystal environment and affects the molecular dimensions of thiourea, CS(NH2)2, consistently with changing contributions of the thione and zwitterionic mesomers. The ambient-pressure phase V (space-group Pnma, Z = 4) at 0.34 GPa transforms to phase VI, of the same space-group symmetry, but with the larger unit-cell trifold (Z = 12). Another pressure-induced transition to phase VII was previously postulated for thiourea at 0.54 GPa; however, no associated structural transformations were identified. Our high-pressure single-crystal X-ray diffraction study reveals that following the transition at 0.34 GPa the lattice parameters and crystal structure strongly and monotonically change to about 0.65 GPa while the crystal symmetry is retained.

中文翻译:

高压转变与硫脲的共振结构

高压增加了晶体环境中的分子间相互作用,并影响了硫脲,CS(NH 22的分子尺寸,并与硫酮和两性离子型共聚单体的贡献不断变化保持一致。在0.34 GPa的环境压力阶段V(空间​​群PnmaZ = 4)转换为具有相同空间群对称性但具有较大的单胞三倍折叠(Z= 12)。先前假设在0.54 GPa压力下会发生另一种压力诱导的向VII相的转变;但是,没有发现相关的结构转变。我们的高压单晶X射线衍射研究表明,在0.34 GPa处发生转变后,晶格参数和晶体结构强烈单调地变化为约0.65 GPa,同时保持了晶体对称性。
更新日期:2018-02-12
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