title: 2,2'-[1,1'-(Propane-1,3-diyldioxy-dinitrilo)diethyl-idyne]di-1-naphthol.
abstract: The mol-ecule of the title compound, C(27)H(26)N(2)O(4), lies across a crystallographic inversion centre and adopts an l-shaped configuration. Within the mol-ecule, the two naphthalene units are approximately perpendicular, making a dihedral angle of 80.24 (5)°. The two intramolecular O-H⋯N hydrogen bonds, generate S(6) ring motifs. In the crystal structure, every mol-ecule links five other mol-ecules into an infinite cross-linked layered supra-molecular structure via inter-molecular C-H⋯O hydrogen bonds, C-H⋯π inter-actions and π-π stacking inter-actions [centroid-centroid distance = 3.956 (4) Å].
authors.affiliation: School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou 730070, People's Republic of China.
authors.forename: Wen-Kui
authors.initials: WK
authors.lastname: Dong
authors.forename: Jian-Chao
authors.initials: JC
authors.lastname: Wu
authors.forename: Yin-Xia
authors.initials: YX
authors.lastname: Sun
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: Jian
authors.initials: J
authors.lastname: Yao