The redetermined crystal structures of hexane-1, 6-diammonium dichloride, C6H18N22+· 2Cl−,(I), hexane-1, 6-diammonium dibromide, C6H18N22+· 2Br−,(II), and hexane-1, 6- diammonium diiodide, C6H18N22+· 2I−,(III), are described, focusing on their hydrogen- ...