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(CH3)2(CH3NH2)2Cl2 crystallizes in the monoclinic P2_1/m space group. The structure is zero-dimensional and consists of two hydrochloric acid molecules, two methane molecules, and two methylammonium molecules.
C2NH8Cl crystallizes in the orthorhombic Ibam space group. The structure is one-dimensional and consists of four C2NH8Cl ribbons oriented in the (1, 0, 0) direction. 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. All C–H bond lengths are 1.10 Å. N3- is bonded in a tetrahedral geometry to two equivalent C2- and two H1+ atoms. Both N–H bond lengths are 1.06 Å. There are five inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N3- and one Cl1- atom. The H–Cl bond length is 2.05 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N3- and one Cl1- atom. The H–Cl bond length is 2.03 Å. 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 C2- atom. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to one C2- atom. Cl1- is bonded in a water-like geometry to two H1+ atoms.