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首页> 外文期刊>Acta crystallographica. Section C, Structural chemistry. >Polymorphism of a widely used building block for halogen-bonded assemblies: 1,3,5-trifluoro-2,4,6-triiodobenzene
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Polymorphism of a widely used building block for halogen-bonded assemblies: 1,3,5-trifluoro-2,4,6-triiodobenzene

机译:用于卤素键合组合的广泛使用的构建块的多态性:1,3,5-三氟-2,4,6-三碘苯

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摘要

After reporting the structure of a new polymorph of 1,3,5-trifluoro-2,4,6-triiodobenzene (denoted BzF3I3), C_6F_3I_3, (I), which crystallized in the space group P21/c, we perform a comparative analysis with the already reported P21/n polymorph, (II) [Reddy et al. (2006). Chem. Eur. J. 12, 2222-2234]. In polymorph (II), type-II I???I halogen bonds and I???pi interactions connect molecules in such a way that a three-dimensional structure is formed; however, the way in which molecules are connected in polymorph (I), through type-II I???I halogen bonds and pi-pi interactions, gives rise to an exfoldable lamellar structure, which looks less tightly bound than that of (II). In agreement with this structural observation, both the melting point and the melting enthalpy of (I) are lower than those of (II).
机译:在报道在空间组P21 / C中结晶的1,3,5-三氟-2,4,6-三碘苯(表示的BZF3I3),C_6F_3I_3,(I)的组合,我们进行比较分析 已经报道了p21 / n多晶型物(ii)[reddy等人。 (2006)。 化学。 欧元。 J. 12,2222-2234]。 在多晶型(II)中,I型I-II-II-II ??? I卤素键和I ??? PI相互作用以这样的方式连接分子,使得形成三维结构; 但是,在多晶型(I)中,通过II型I-I I-I I-I I-II-II-II-I I-I I I-II-II-II-I II-II键相互作用,将分子与PI-PI相互作用相连,产生脱脂的层状结构,其看起来少于(II II) )。 在这种结构观察中,熔点和(I)的熔点焓低于(II)的熔点。

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