title: 5,5'-Dimeth-oxy-2,2'-[(pentane-1,5-diyl-dioxy)bis-(nitrilo-methyl-idyne)]diphenol.
abstract: The mol-ecule of the title compound, C(21)H(26)N(2)O(6), which lies across a crystallographic inversion centre, crystallizes with two unique half-molecules in the symmetric unit and adopts a linear configuration and the imino group is coplanar with the aromatic ring, making a dihedral angle of 3.26 (3)°. Strong intra-molecular O-H⋯N and weak inter-molecular O-H⋯O and C-H⋯O hydrogen bonds and weak inter-molecular π-π stacking inter-actions [centroid-centroid distance = 4.419 (2) Å]establish an infinite three-dimensional supra-molecular structure.
authors.affiliation: School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou 730070, People's Republic of China.
authors.forename: Yin-Xia
authors.initials: YX
authors.lastname: Sun
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: Wen-Kui
authors.initials: WK
authors.lastname: Dong
authors.forename: Jian-Chao
authors.initials: JC
authors.lastname: Wu
authors.forename: Jun-Feng
authors.initials: JF
authors.lastname: Tong