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Pressure-frozen 1,2,3-trichloropropane

机译:1,2,3-三氯丙烷冷冻

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摘要

The structure of 1,2,3-trichloropropane, ClCH2CHClCH2Cl, in-situ crystallized in a diamond-anvil cell, has been determined by single-crystal X-ray diffraction at 0.28 and 0.35 GPa. A melting point at 295 K and 0.22 GPa has been determined. The molecular conformation of aliphatic chain and terminal Cl atoms is approximately C-2 symmetric. Of the intermolecular contacts, the tightest are the (ClCl)-Cl-... and then the (ClH)-H-... contacts, whereas the (HH)-H-... distances are considerably longer than the sum of the van der Waals radii and leave narrow voids in the structure. The elevated pressure reduces the (HH)-H-... separations but hardly affects the (ClCl)-Cl-... distances. The crystal growth rates, compression and types of intermolecular interactions in the structures can be correlated with the directions of the (ClCl)-Cl-... contacts, which can be considered the main motif responsible for the molecular arrangement in the structure.
机译:通过单晶X射线衍射在0.28和0.35 GPa下确定了在金刚石-砧室中原位结晶的1,2,3-三氯丙烷ClCH2CHClCH2Cl的结构。已确定熔点为295 K和0.22 GPa。脂族链和末端C 1原子的分子构象约为C-2对称。在分子间接触中,最紧密的是(ClCl)-Cl -...然后是(ClH)-H -...接触,而(HH)-H -...的距离比总和长得多范德华半径半径,并在结构中留下狭窄的空隙。升高的压力减少了(HH)-H -...的分离,但几乎不影响(ClCl)-Cl -...的距离。结构中的晶体生长速率,压缩和分子间相互作用的类型可以与(ClCl)-Cl -...接触的方向相关,可以将其视为负责结构中分子排列的主要基序。

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