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In the title hydrated salt, C 16 H 38 N 4   2+ ·2ClO 4   − ·H 2 O, the dication is protonated at the diagonally opposite N atoms proximate to the –C(CH 3 ) 2 – groups. Within the cavity, there are two ammonium–amine N—H⋯N hydrogen bonds. Supra­molecular layers are formed in the crystal packing whereby the water mol­ecule links two perchlorate anions, and the resultant aggregates are connected to the dications  via  N—H⋯O hydrogen bonds. Layers, with an undulating topology, stack along the  a  axis being connected by C—H⋯O inter­actions.

5,7,7,12,14,14-Hexamethyl-4,11-diaza-1,8-diazoniacyclotetradecane bis(perchlorate) monohydrate