title: Crystal structure of dimethyl 3,3'-[(3-nitro-phen-yl)methyl-ene]bis-(1H-indole-2-carboxyl-ate) ethanol monosolvate.
abstract: In the title compound, C27H21N3O6·C2H5OH, the indole ring systems are approximately perpendicular to each other, with a dihedral angle of 89.3 (5)°; the plane of the benzene ring is oriented with respect to the indole ring systems at 49.9 (5) and 73.4 (3)°. In the crystal, mol-ecules are linked by N-H⋯O and O-H⋯O hydrogen bonds and weak C-H⋯π inter-actions into a three-dimensional supra-molecular architecture. A void of 33.0 (7) Å(3) is observed in the crystal structure. The solvent ethanol molecule acts as a donor, forming an O-H⋯O hydrogen bond, reinforcing the framework structure.
authors.affiliation: Chemical Engineering Department, Nanjing College of Chemical Technology, Nanjing 210048, People's Republic of China.
authors.forename: Hong-Shun
authors.initials: HS
authors.lastname: Sun
authors.affiliation: Chemical Engineering Department, Nanjing College of Chemical Technology, Nanjing 210048, People's Republic of China.
authors.forename: Yu-Long
authors.initials: YL
authors.lastname: Li
authors.affiliation: Chemical Engineering Department, Nanjing College of Chemical Technology, Nanjing 210048, People's Republic of China.
authors.forename: Hong
authors.initials: H
authors.lastname: Jiang
authors.affiliation: Chemical Engineering Department, Nanjing College of Chemical Technology, Nanjing 210048, People's Republic of China.
authors.forename: Ning
authors.initials: N
authors.lastname: Xu
authors.affiliation: Chemical Engineering Department, Nanjing College of Chemical Technology, Nanjing 210048, People's Republic of China.
authors.forename: Hong
authors.initials: H
authors.lastname: Xu
keywords: MRI contrast agent; crystal structure; indole