Involvement of conformational isomerism in the complexity of the crystal network of 1-(4-nitrophenyl)-1<i>H</i>-1,3-benzimidazole derivatives driven by C—H...<i>A</i> (<i>A</i> = NO<sub>2</sub>, N<sub>py</sub> and π) and orthogonal N<sub>py</sub>...NO<sub>2</sub> and ONO...C<i>sp</i>
<sup>2</sup> interactions
作者:Mónica I. García-Aranda、Carlos Z. Gómez-Castro、Efrén V. García-Báez、Yolanda Gómez y Gómez、José L. Castrejón-Flores、Itzia I. Padilla-Martínez
DOI:10.1107/s2053229618003406
日期:2018.4.1
contribute to the stabilization of the equi-energetic conformations adopted by each of the independent molecules in the asymmetric unit. In contrast, compound (III) (Z' = 1) is self-paired, probably due to the effect of the steric demand of the methyl group on the crystal packing. Theoretical ab initio calculations confirmed that the presence of the arene ring at the benzimidazole 2-position increases the
苯并咪唑硝基芳烃 1-(4-硝基苯基)-1H-1,3-苯并咪唑, C13H9N3O2, (I), 1-(4-硝基苯基)-2-苯基-1H-1,3-苯并咪唑的详细结构分析,已进行 C19H13N3O2 (II) 和 2-(3-甲基苯基)-1-(4-硝基苯基)-1H-1,3-苯并咪唑 C20H15N3O2 (III)。它们是非平面结构,其晶体排列由 Csp2-H...A(A = NO2、Npy 和 π)氢键控制。化合物 (I) (Z' = 2) 和 (II) (Z' = 4) 超分子排列成带状、螺旋状和片状的固有复杂性是 π-πNO2 和 n-π* 额外参与的结果(n = O 和 Npy;π* = Csp2 和 NNO2)相互作用有助于稳定不对称单元中每个独立分子所采用的等能构象。相反,化合物(III) (Z' = 1)是自配对的,可能是由于甲基的空间需求对晶体堆积的影响。理论从头计算证实,苯并咪唑