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