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首页> 外文期刊>Acta Crystallographica Section E: Crystallographic Communications >Crystal structure of [1,1′:3′,1′′-ter­phenyl]-2′,3,3′′-tri­carb­oxy­lic acid
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Crystal structure of [1,1′:3′,1′′-ter­phenyl]-2′,3,3′′-tri­carb­oxy­lic acid

机译:[1,1':3',1''-三联苯] -2',3,3''-三羧酸的晶体结构

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The asymmetric unit of the title compound, C21H14O6, com­prises two symmetrically independent mol­ecules that form a locally centrosymmetric hydrogen-bonded dimer, with the planes of the corresponding carb­oxy­lic acid groups rotated by 15.8 (1) and 17.5 (1)° relative to those of the adjacent benzene rings. The crystal as a whole, however, exhibits a noncentrosymmetric packing, described by the polar space group Pca21. The dimers form layers along the ab plane, being inter­connected by hydrogen bonds involving the remaining carb­oxy­lic acid groups. The plane of the central carb­oxy­lic acid group forms dihedral angles of 62.5 (1) and 63.0 (1)° with those of the adjacent benzene rings and functions as a hydrogen-bond donor and acceptor. As a donor, it inter­connects adjacent layers, while as an acceptor it stabilizes the packing within the layers. The `distal' carb­oxy­lic acid groups are nearly coplanar with the planes of the adjacent benzene rings, forming dihedral angles of 1.8 (1) and 7.1 (1)°. These groups also form intra- and inter-layer hydrogen bonds, but with `reversed' functionality, as compared with the central carb­oxy­lic acid groups.
机译:标题化合物C21H14O6的不对称单元包含两个对称的独立分子,它们形成局部中心对称的氢键二聚体,相应的羧酸基团的平面相对于C21H14O6的平面旋转了15.8(1)和17.5(1)°。相邻的苯环。然而,整个晶体表现出非中心对称堆积,由极性空间群Pca21表示。二聚体沿着ab平面形成层,通过涉及其余羧酸基团的氢键相互连接。中心羧酸基团的平面与相邻的苯环的平面形成62.5°(1)和63.0°(1)°的二面角,并起氢键供体和受体的作用。作为供体,它使相邻的层互连,而作为受体,它使层内的填充物稳定。 “远端”羧酸基团与相邻苯环的平面几乎共面,形成1.8(1)和7.1(1)°的二面角。这些基团还形成层内和层间氢键,但与中心羧酸基团相比具有“反向”功能。

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