title: Crystal structure of 4,5-di-nitro-1H-imidazole.
abstract: The title compound, C3H2N4O4, forms crystals with two mol-ecules in the asymmetric unit which are conformationally similar. With the exception of the O atoms of the nitro groups, the mol-ecules are essentially planar. In the crystal, adjacent mol-ecules are associated by N-H⋯N hydrogen bonds involving the imidazole N-H donors and N-atom acceptors of the unsaturated nitro-gen of neighboring rings, forming layers parallel to (010).
authors.affiliation: PO Box 1663 MS C920, Los Alamos National Laboratory, Los Alamos, NM 87544, USA.
authors.forename: G Kenneth
authors.initials: GK
authors.lastname: Windler
authors.affiliation: PO Box 1663 MS J514, Los Alamos National Laboratory, Los Alamos, NM 87544, USA.
authors.forename: Brian L
authors.initials: BL
authors.lastname: Scott
authors.affiliation: PO Box 1663 MS J514, Los Alamos National Laboratory, Los Alamos, NM 87544, USA.
authors.forename: Neil C
authors.initials: NC
authors.lastname: Tomson
authors.affiliation: PO Box 1663 MS C920, Los Alamos National Laboratory, Los Alamos, NM 87544, USA.
authors.forename: Philip W
authors.initials: PW
authors.lastname: Leonard
keywords: 4,5-di­nitro-1H-imidazole; crystal structure; hydrogen bonding