Crystal structure of 1,4,8,11-tetra­azonia­cyclo­tetra­decane bis­­(dichromate) monohydrate from synchrotron data

The asymmetric unit of the hydrated title salt, (C10H28N4)[Cr2O7]2·H2O [C10H28N4 = H4(cyclam) = 1,4,8,11-tetra­azonia­cyclo­tetra­deca­ne], contains two half-cations (both completed by crystallographic inversion symmetry), two dichromate anions and one water mol­ecule. The two [CrO7]2− anions exhibit a nearly staggered conformation, with bridging angles of 133.37 (11) and 136.28 (12)°. The distortions of the dichromate anions are due to their participation in hydrogen-bonding inter­actions with the water mol­ecule and the cations. Inter­molecular hydrogen bonds involving the cyclam N—H groups and water O—H groups as donor groups, and the O atoms of the dichromate anions as acceptor groups give rise to a three-dimensional network.