title: Two polymorphs of trans-[3-(3-nitro-phen-yl)oxiran-2-yl](phen-yl)methanone.
abstract: The title compound, C15H11NO4, crystallizes in two polymorphic forms, centrosymmetric monoclinic and chiral ortho-rhom-bic. The geometry of the mol-ecules in the two polymorphs is slightly different, possibly due to inter-molecular inter-actions. There are no classical hydrogen bonding in these two structures. However, a number of C-H⋯O inter-molecular inter-actions, involving both O atoms of the nitro as well the benzoyl groups, stabilize the crystal structures.
authors.affiliation: Chemistry Department, SUNY Buffalo State, 1300 Elmwood Ave, Buffalo, NY 14222, USA.
authors.forename: Fred H
authors.initials: FH
authors.lastname: Greenberg
authors.affiliation: Chemistry Department, SUNY Buffalo State, 1300 Elmwood Ave, Buffalo, NY 14222, USA.
authors.forename: Alexander Y
authors.initials: AY
authors.lastname: Nazarenko
keywords: chalcone oxide; crystal structure; polymorphism