Discrete water clusters in tetra-μ-cyanido-tetra­cyanidobis(1,4,7-triisopropyl-1,4,7-triaza­cyclo­nona­ne)dicopper(II)dinickel(II) tetra­hydrate

The title tetra­cyanido­nickelate–copper complex, [Cu(2)Ni(2)(CN)(8)(C(15)H(33)N(3))(2)]·4H(2)O, was synthesized by self-assembly using potassium tetracyanidonickelate(II) and dichlorido(1,4,7-triisopropyl-1,4,7-triazacyclononane)copper(II). The asymmetric unit contains half of a complex mol­ecule and two water mol­ecules. The entire complex has -1 symmetry and contains Ni(II) in a slightly distorted square-planar and Cu(II) in a square-pyramidal coordination environment. The crystal packing shows a discrete tetra­mer water cluster. Within the cluster, the four water mol­ecules are fully coplanar and each water monomer acts both as single O—H⋯O and O—H⋯N hydrogen-bond donor and acceptor.