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Molecular pair analysis: C-H...F interactions in the crystal structure of fluorohenzene? And related matters

机译:分子对分析:氟苯的晶体结构中的C-H ... F相互作用?及相关事项

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摘要

The crystal structure of fluorobenzene is compared with isomorphous crystal structures of molecules of roughly similar shape. The lowest-energy fluorobenzene dimers are identified by theoretical calculations. Molecular pair analysis of the crystal structure of fluorobenzene and of an isomorphous virtual low-energy polymorph of benzene suggests that the important intermolecular interactions in the two structures are closely similar. In particular, the intermolecular C-(HF)-F-... interactions in the fluorobenzene crystal have approximately the same structure-directing ability and influence on the intermolecular energy as the corresponding C-(HH)-H-... interactions in benzene. Molecular pair analysis of the isomorphous crystal structures of benzonitrile, alloxan, and cyclopentene-1,2,3-trione indicates that essentially the same crystal structure can be adopted with quite different patterns of pair energies and atom-atom interactions. The question as to whether the packing radius of organic fluorine is larger or smaller than that of hydrogen, is addressed, but not answered.
机译:将氟苯的晶体结构与形状近似相似的分子的同构晶体结构进行比较。最低能量的氟苯二聚体通过理论计算确定。氟苯晶体结构和苯同构虚拟低能多晶型物的分子对分析表明,这两种结构中重要的分子间相互作用非常相似。特别地,氟苯晶体中的分子间C-(HF)-F -...相互作用具有与相应的C-(HH)-H -...相互作用大致相同的结构导向能力并影响分子间能。在苯中。苯甲腈,四氧嘧啶和环戊烯-1,2,3-三酮的同构晶体结构的分子对分析表明,可以采用基本相同的晶体结构,并且具有不同的成对能量和原子-原子相互作用模式。关于有机氟的堆积半径是大于还是小于氢的堆积半径的问题已经解决,但是没有得到回答。

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