The solid-state structure of the title compound, alternatively called 2-aminoanilinium hydrogen phosphonate, C(6)H(9)N(2)(+).H(2)PO(3)(-), shows the monoprotonated diamine molecule to be multiply hydrogen bonded to HPO(3)H(-) anions. There is no inter-phosphite hydrogen bonding, contrary to previous solid-state observations of the species.

The structure of the title compound, (NH4)2[Mg(H2O)6]3(HPO3)4, consists of [Mg(H2O)6]2+ and (NH4)+ cations and (HPO3)2- anions held together by an intricate network of hydrogen bonds involving all H atoms except for one linked directly to a P atom. The Mg2+ cations are octahedrally coordinated by six water molecules. One of the Mg atoms is located on a site with 2/m symmetry, whereas the other Mg atom and the P and N atoms occupy sites with m symmetry.

A new energetic organic potassium salt of dihydridobis (3-nitro-1,2,4-triazolyl) borate was synthesized from 3-nitro-1,2,4-triazole and potassium borohydride at 110 °C, and structurally characterized by elemental analysis, IR spectra, 13C NMR and singlecrystal X-ray diffraction. Results show that the crystal belongs to monoclinic system with space group of p21 / C and cell parameters of a = 10.335 (8) Å, B = 10.812 (8) Å, C = 9.821 (8) Å, α = 90 ˚, β = 106.470 (13), γ = 90 °, z = 4. Its crystal density is 1.755g/cm3. Thermal properties were studied with TG-DTA and DSC. There was only one sharp decomposition peak temperature of 270 °C at the heating rate of 10 °C/ min-1. The activation energies EK = 48.0kJ/mol-1 and EO = 49.8kJ/mol-1 were calculated by the Kissinger method and Ozawa method respectively (CCDC: 1975139).

Structure D 2000Bis (ammonium) Tris(hexaaquamagnesium) Tetrakis(hydrogen phosphite). -(NH4)2[Mg(H2O)6]3(HPO3)4 crystallizes in the monoclinic space group C2/m with Z = 2 (single crystal XRD). The structure consists of [Mg(H2O)6] 2+ , , and ions held together by an intricate network of hydrogen bonds involving all H atoms except for the one linked directly to phosphorus. -(ABDALLAH, K. I.; MOHAMED, S.; MOHAMED, R.; ABDELHALIM*, G.; Acta Crystallogr., Sect. C: Cryst. Struct. Commun. 62 (2006) 6, i43-i45; Lab. Dyn. Struct. Mater. Mol., CNRS, Univ. Sci. Technol. Lille-Flandres-Artois, F-59655 Villeneuve d'Ascq, Fr.; Eng.) -Schramke 36-009 NH + 4 HPO 2 -3