title: Heptane-1,7-diaminium sulfate mono-hydrate.
abstract: The crystal structure of the title compound, C(7)H(20)N(2) (2+)·SO(4) (2-)·H(2)O, is presented, with particular focus on the packing arrangement in the crystal structure and selected hydrogen-bonding inter-actions that the compound forms. The crystal structure exhibits parallel stacking of the diammonium dication in its packing arrangement, together with inorganic-organic layering that is typical of these n-alkyl-diammonium salts. An intricate three-dimensional hydrogen-bonding network exists in the crystal structure where the hydrogen bonds link the cation and anion layers together through the sulfate anions and the water mol-ecules.
authors.affiliation: Department of Chemistry, University of Johannesburg, PO Box 524, Auckland Park, Johannesburg 2006,  South Africa.
authors.forename: Charmaine
authors.initials: C
authors.lastname: Arderne
references.citation: Acta Crystallogr B. 2002 Jun;58(Pt 3 Pt 1):380-8
references.pmid: 12037359
references.citation: Acta Crystallogr A. 2008 Jan;64(Pt 1):112-22
references.pmid: 18156677
references.citation: Acta Crystallogr D Biol Crystallogr. 2009 Feb;65(Pt 2):148-55
references.pmid: 19171970