Crystal structure of bis­(1,4-di­aza­bicyclo­[2.2.2]octan-1-ium) thio­sulfate dihydrate

The crystal structure of the hydrated title salt, 2C(6)H(13)N(2) (+)·S(2)O(3) (2−)·2H(2)O, contains a centrosymmetric cyclic motif of eight hydrogen-bonded mol­ecular subunits. Two DABCOH(+) cations (DABCO = 1,4-di­aza­bicyclo­[2.2.2]octa­ne) are linked to two water mol­ecules and two thio­sulfate anions via O—H⋯N and O—H⋯O hydrogen bonds, respectively. Two other water mol­ecules close the cyclic motif through O—H⋯O contacts to the first two water mol­ecules and to the two thio­sulfate anions. A second pair of DABCOH(+) cations is N—H⋯O hydrogen bonded to the two anions and is pendant to the ring. Adjacent cyclic motifs are bridged into a block-like arrangement extending along [100] through O—H⋯O inter­actions involving the second pair of water mol­ecules and neighbouring thio­sulfate anions.