Mu-1,4-benzenedicarboxylato-bis[trans-aqua(1,4,8,11-tetraazacyclotetradecane)nickel(II)] diperchlorate forms a three-dimensional hydrogen-bonded framework.

The title compound, [Ni2(C8H4O4)(C10H24N4)2(H2O)2](ClO4)2, contains two independent octahedral Ni(II) centres with trans-NiN4O2 chromophores. The bridging benzenedicarboxylate ligand is bonded to the two Ni atoms, each via one O atom of each carboxylate, while the other O atom participates in an intramolecular N-H...O hydrogen bond, forming an S(6) motif. The cations are linked to the perchlorate anions via O-H...O and N-H...O hydrogen bonds [O...O 2.904 (6) and 2.898 (6) A; O-H...O 158 (6) and 165 (6) degrees; N...O 3.175 (7) and 3.116 (7) A; N-H...O 168 and 166 degrees ] to form molecular ladders. These ladders are linked by further O-H...O and N-H...O hydrogen bonds [O...O 2.717 (6) and 2.730 (5) A; O-H...O 170 (4) and 163 (6) degrees; N...O 3.373 (7) and 3.253 (7) A; N-H...O 163 and 167 degrees ] to form a continuous three-dimensional framework. The perchlorate anions both participate in three hydrogen bonds, and both are thus fully ordered.