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CH3CH3NH2Br crystallizes in the monoclinic P2_1/m space group. The structure is zero-dimensional and consists of two hydrobromic acid molecules, two methane molecules, and two methylammonium molecules.
C2NH8Br crystallizes in the monoclinic C2/c space group. The structure is one-dimensional and consists of four C2NH8Br ribbons oriented in the (0, 1, 0) direction. there are two inequivalent C2- sites. In the first C2- site, C2- is bonded to one N3- and three H1+ atoms to form corner-sharing CH3N tetrahedra. The C–N bond length is 1.49 Å. There is two shorter (1.09 Å) and one longer (1.10 Å) C–H bond length. In the second C2- site, C2- is bonded to one N3- and three H1+ atoms to form corner-sharing CH3N tetrahedra. The C–N bond length is 1.49 Å. There is two shorter (1.09 Å) and one longer (1.10 Å) C–H bond length. N3- is bonded in a tetrahedral geometry to two C2- and two H1+ atoms. Both N–H bond lengths are 1.05 Å. There are seven inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one C2- atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one C2- atom. In the third H1+ site, H1+ is bonded in a single-bond geometry to one C2- atom. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one N3- and one Br1- atom. The H–Br bond length is 2.29 Å. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to one C2- atom. In the sixth H1+ site, H1+ is bonded in a single-bond geometry to one C2- atom. In the seventh H1+ site, H1+ is bonded in a single-bond geometry to one N3- and one Br1- atom. The H–Br bond length is 2.28 Å. Br1- is bonded in a distorted L-shaped geometry to two H1+ atoms.