A new class of flexible energetic salts, part 5: The structures of two hexammonium polymorphs and the ethane-1,2-diammonium salts of dinitramide

The crystal structures of two hexammonium polymorphs, 1 and 2, and the etha ne-1,2-diammonium, 3, salts of dinitramide have been determined. 1 crystall izes in the triclinic space group <P(1)over bar> with cell dimensions a = 6 .391(2), b = 7.5826(9), c = 10.828(1) Angstrom, a = 77.58(1), beta = 88.18 (2), gamma = 87.54(2)degrees, 2 crystallizes in the monoclinic space group P2(1)/c with cell dimensions a = 6.4893(3), b = 14.5149(8), c = 10.6557(4) Angstrom, beta = 94.300(4)degrees and 3 crystallizes in the triclinic space group <P(1)over bar> with cell dimensions a = 5.614(1), b = 6.867(2), c = 7.371(2) Angstrom, alpha = 68.89(2), beta = 89.00(2), gamma = 78.90(2)degre es. The three structures all contain protonated amine cations which are inv olved in hydrogen bonding interactions with dinitramide anions.