Kia Reza, Fun Hoong-Kun, Kargar Hadi
Acta Crystallogr Sect E Struct Rep Online. 2009 Mar 6;65(Pt 4):o682-3. doi: 10.1107/S1600536809007284.
The mol-ecule of the title Schiff base compound, C(18)H(14)N(4), lies across a crystallographic inversion centre and adopts an E configuration with respect to the azomethine (C=N) bonds. The imino groups are coplanar with the aromatic rings with a maximum deviation of 0.1574 (12) Å for the N atom. Within the mol-ecule, the planar units are parallel, but extend in opposite directions from the dimethyl-ene bridge. In the crystal structure, pairs of inter-molecular C-H⋯N hydrogen bonds link neighbouring mol-ecules into centrosymmetric dimers with R(2) (2)(10) ring motifs. An inter-esting feature of the crystal structure is the short inter-molecular C⋯C inter-action with a distance of 3.3821 (13) Å, which is shorter than the sum of the van der Waals radius of a carbon atom.
标题席夫碱化合物C(18)H(14)N(4)的分子位于一个晶体学反演中心上，且相对于偶氮甲碱（C=N）键采取E构型。亚氨基与芳环共平面，N原子的最大偏差为0.1574 (12) Å。在分子内，平面单元相互平行，但从亚甲基桥向相反方向延伸。在晶体结构中，分子间的C—H⋯N氢键对将相邻分子连接成具有R(2) (2)(10)环 motif的中心对称二聚体。晶体结构的一个有趣特征是分子间C⋯C相互作用较短，距离为3.3821 (13) Å，这比碳原子范德华半径之和还短。
