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1,1-Diamino-2,2-dinitroethylene: a Novel Energetic Material with Infinite Layers in Two Dimensions
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1998
Year
Materials ScienceInorganic ChemistryInteresting High ExplosiveNovel Energetic MaterialInfinite LayersEngineeringCrystal StructureMolecular SolidOrganic Material ChemistryLow Dimensional MaterialMolecular MaterialOrganic ChemistryChemistryMolecular ChemistryLayered MaterialTitle CompoundCrystallographyCrystal Structure Design
The title compound (C2H4N4O4) is a novel and interesting high explosive with high performance and low sensitivity. Single-crystal X-ray diffraction studies of the compound show that the molecules in the crystal structure have bond lengths and bond angles as expected for this type of push–pull ethylene. There are two intramolecular hydrogen bonds present between the nitro-O atoms and the amino-H atoms. The geometry of the molecule indicates that there is extensive π conjugation present. The molecular packing is built up by infinite two-dimensional wave-shaped layers, with extensive intermolecular hydrogen bonding within the layers and ordinary van der Waals interactions between the layers. The crystal packing explains some of the physico–chemical properties of the compound such as the absence of a melting point, its low solubility and its low sensitivity to friction and impact compared with the common high explosive RDX (1,3,5-triaza-1,3,5-trinitrocyclohexane).