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Crystals 2012, 2(1), 34-42; doi:10.3390/cryst2010034
Article

Molecular and Crystal Structure of a New High Energy Density Material: Aminoguanidinium-styphnate, [H2NNHC(NH2)2]2[C6HO2(NO2)3]

1, 2, 1 and 2,*
1 Nammo Germany GmbH, Wilhelm-Dümling-Street 12, 39218 Schönebeck, Germany 2 Chemisches Institut der Otto-von-Guericke-Universität Magdeburg, 39106 Magdeburg, Germany
* Author to whom correspondence should be addressed.
Received: 2 September 2011 / Revised: 20 December 2011 / Accepted: 26 December 2011 / Published: 4 January 2012
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Abstract

The title compound [H2NNHC(NH2)2]2[C6HO2(NO2)3] (2) was prepared in 85% yield by treatment of sodium styphnate with 2 equivalents of aminoguanidinium nitrate, followed by crystallization from aqueous solution. Compound 2 crystallizes in the triclinic space group Pī with unit cell dimensions a = 6.7224(3) Å, b = 10.7473(4) Å, c = 11.9604(5) Å, α = 113.212(4)°, β = 90.579(3)°, γ = 99.815(3)°, V = 779.68(6) Å3, Z = 2. In the solid state structure of 2, no water of crystallization is present. Bond angles within the aromatic ring of the styphnate anion indicate a significant distortion with larger angles (122.04(18)–125.96(18) Å) at the carbons bearing the nitro groups, and smaller ones (113.30(17) and 114.07(17) Å) at the C-O carbon atoms. The crystal structure of 2 consists of layers formed by an extensive network of N-H...O hydrogen bonds between NH2 groups of the aminoguanidinium cation and the negatively charged oxygens of the styphnate anion. The layers are again interconnected by N-H...N hydrogen bonds between neighboring aminoguanidinium cations.
Keywords: high density energy materials; styphnates; aminoguanidinium styphnate; hydrogen bonds high density energy materials; styphnates; aminoguanidinium styphnate; hydrogen bonds
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Deblitz, R.; Hrib, C.G.; Plenikowski, G.; Edelmann, F.T. Molecular and Crystal Structure of a New High Energy Density Material: Aminoguanidinium-styphnate, [H2NNHC(NH2)2]2[C6HO2(NO2)3]. Crystals 2012, 2, 34-42.

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