title: Packing polymorphism in the crystal structure of 4,5-dimeth-oxy-2-nitro-benzyl acetate.
abstract: The title compound, C11H13NO6, shows two polymorphs, orange and yellow forms, both of which crystallize in the space group P21/c. The mol-ecular structures in the two polymorphs are essentially similar and adopt a planar structure, the maximum deviations for the non-H atoms being 0.1836 (13) and 0.1276 (13) Å, respectively, for the orange and yellow forms. In the orange crystal, mol-ecules are linked by an inter-molecular C-H⋯O inter-action into a helical chain along the b-axis direction. The chains are stacked along the c axis through a π-π inter-action [centroid-centroid distance = 3.6087 (11) Å], forming a layer parallel to the bc plane. In the yellow crystal, mol-ecules are connected through C-H⋯O inter-actions into a sheet structure parallel to (-302). No significant π-π inter-action is observed. The unit-cell volume of the orange crystal is larger than that of the yellow one, and this accounts for the predominant growth of the yellow crystal.
authors.affiliation: Department of Materials Science, Faculty of Science, Kanagawa University, Tsuchiya, Hiratsuka, Kanagawa 259-1293, Japan.
authors.forename: Noriko Chikaraishi
authors.initials: NC
authors.lastname: Kasuga
authors.affiliation: Department of Materials Science, Faculty of Science, Kanagawa University, Tsuchiya, Hiratsuka, Kanagawa 259-1293, Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Saito
authors.affiliation: Rigaku Corporation 3-9-12 Matsubara-cho, Akishima, Tokyo 196-8666, Japan.
authors.forename: Hiroyasu
authors.initials: H
authors.lastname: Sato
authors.affiliation: Department of Materials Science, Faculty of Science, Kanagawa University, Tsuchiya, Hiratsuka, Kanagawa 259-1293, Japan.
authors.forename: Kazuo
authors.initials: K
authors.lastname: Yamaguchi
keywords: 2-nitro­benzyl ester; C—H⋯O inter­actions; crystal structure; packing polymorphism; π–π inter­actions