Bernès Sylvain, Hernández Guadalupe, Vázquez Jaime, Tovar Alejandra, Gutiérrez René
Acta Crystallogr Sect E Struct Rep Online. 2010 Oct 31;66(Pt 11):o2988. doi: 10.1107/S1600536810043424.
The title mol-ecule, C(26)H(24)N(2)O(2), displays C(2) symmetry, with the mol-ecule located on a twofold axis perpendicular to the plane of the oxalamide unit -NH-CO-CO-NH-. The oxalamide core deviates from planarity, as reflected by the O=C-C=O and N-C-C-N torsion angles of 164.3 (5) and 163.2 (5)°, respectively. The naphthyl groups are oriented toward the same face of the oxalamide mean plane and make a dihedral angle of 43.76 (8)°. This conformation is suitable for the formation of inter-molecular N-H⋯O hydrogen bonds, giving noncentrosymmetric dimers incorporating R(2) (2)(10) ring motifs. These nonbonding inter-actions propagate along the 6(1) screw axis normal to the mol-ecular twofold axis, resulting in a single-stranded right-handed helix parallel to [001]. In the crystal, Δ helices are arranged side-by-side and inter-act through π-π contacts between naphthyl groups. The shortest centroid-centroid separation between inter-acting benzene rings is 3.623 (4) Å.
标题分子C(26)H(24)N(2)O(2)具有C(2)对称性，分子位于垂直于草酰胺单元-NH-CO-CO-NH-平面的二重轴上。草酰胺核心偏离平面，O=C-C=O和N-C-C-N扭转角分别为164.3 (5)°和163.2 (5)°，反映了这一点。萘基朝向草酰胺平均平面的同一面，二面角为43.76 (8)°。这种构象适合形成分子间N-H⋯O氢键，产生包含R(2) (2)(10)环基序的非中心对称二聚体。这些非键相互作用沿着垂直于分子二重轴的6(1)螺旋轴传播，形成平行于[001]的单链右手螺旋。在晶体中，Δ螺旋并排排列，并通过萘基之间的π-π接触相互作用。相互作用的苯环之间最短的质心-质心距离为3.623 (4) Å。
