Crystal structure of N,N′-bis­­(pyridin-4-ylmeth­yl)cyclo­hexane-1,4-di­ammonium dichloride dihydrate

Treatment of N,N-bis­(pyridin-4-ylmeth­yl)cyclo­hexane-1,4-di­amine with hydro­chloric acid in ethanol led to the formation of the title salt, C18H26N42+·2Cl−·2H2O, which lies about a crystallographic inversion center at the center of the cyclo­hexyl ring. The asymmetric unit therefore comprises one half of the N,N-bis­(pyridin-4-ylmeth­yl)cyclo­hexane-1,4-di­ammonium dication, a chloride anion, and a solvent water mol­ecule. In the dication, the two trans-(4-pyridine)–CH2–NH2– moieties occupy equatorial sites at the 1- and 4-positions of the central cyclo­hexyl ring, which is in a chair conformation. The terminal pyridine ring is tilted by 27.98 (5)° with respect to the mean plane of the central cyclo­hexyl moiety (r.m.s. deviation = 0.2379 Å). In the crystal, dications, anions, and solvent water mol­ecules are connected via N/C/O—H⋯Cl and N—H⋯O hydrogen bonds together with C—H⋯π inter­actions, forming a three-dimensional network.