title: Crystal structure of (3E)-3-[(4-nitro-phen-oxy)-meth-yl]-4-phenyl-but-3-en-2-one.
abstract: In the title compound, C17H15NO4, the conformation about the C=C double bond [1.348 (2) Å] is E with the ketone group almost co-planar [C-C-C-C torsion angle = 7.2 (2)°] but the phenyl group twisted away [C-C-C-C = 160.93 (17)°]. The terminal aromatic rings are almost perpendicular to each other [dihedral angle = 81.61 (9)°] giving the mol-ecule an overall U-shape. The crystal packing feature benzene-C-H⋯O(ketone) contacts that lead to supra-molecular helical chains along the b axis. These are connected by π-π inter-actions between benzene and phenyl rings [inter-centroid distance = 3.6648 (14) Å], resulting in the formation of a supra-molecular layer in the bc plane.
authors.affiliation: Departmento de Química, Universidade Federal de São Carlos, 13565-905 São Carlos, SP, Brazil.
authors.forename: Julio
authors.initials: J
authors.lastname: Zukerman-Schpector
authors.affiliation: Departmento de Física, Universidade Federal de São Carlos, 13565-905 São Carlos, SP, Brazil.
authors.forename: Stella H
authors.initials: SH
authors.lastname: Maganhi
authors.affiliation: Instituto de Química, Universidade Estadual de Campinas, CP 6154, 13083-970 Campinas, SP, Brazil.
authors.forename: Paulo J S
authors.initials: PJ
authors.lastname: Moran
authors.affiliation: Instituto de Química, Universidade Estadual de Campinas, CP 6154, 13083-970 Campinas, SP, Brazil.
authors.forename: Bruno R S
authors.initials: BR
authors.lastname: de Paula
authors.affiliation: Programa de Pós Graduacão em Biotecnologia, Universidade Federal de São Carlos, 13565-905 São Carlos, SP, Brazil.
authors.forename: Paulo R
authors.initials: PR
authors.lastname: Nucci
authors.affiliation: Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia.
authors.forename: Edward R T
authors.initials: ER
authors.lastname: Tiekink
keywords: crystal structure; hydrogen bonding; π–π inter­actions