title: 2,2'-Dichloro-1,1'-[(butane-1,4-diyldi-oxy)bis-(nitrilo-methyl-idyne)]dibenzene.
abstract: The mol-ecule of the title compound, C(18)H(18)Cl(2)N(2)O(2), lies across a crystallographic inversion centre and adopts an E configuration with respect to the azomethine C=N bond. The imino group is coplanar with the aromatic ring. Within the mol-ecule, the planar units are parallel, but extend in opposite directions from the dimethyl-ene bridge. In the crystal structure, the title compound exhibits a layer packing structure via weak π-π stacking inter-actions [inter-molecular plane-to-plane distances between adjacent aromatic rings are 3.461 (3) Å]. Mol-ecules in each layer are linked by inter-molecular C-H⋯O hydrogen-bonding inter-actions.
authors.affiliation: School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou 730070, People's Republic of China.
authors.forename: Zong-Li
authors.initials: ZL
authors.lastname: Ren
authors.forename: Wen-Kui
authors.initials: WK
authors.lastname: Dong
authors.forename: Wen-Juan
authors.initials: WJ
authors.lastname: Bai
authors.forename: Xue-Ni
authors.initials: XN
authors.lastname: He
authors.forename: Li
authors.initials: L
authors.lastname: Wang