A three‐dimensional CuII–WIV bimetallic porous assembly containing a zigzag ladder structure

The asymmetric unit of the three‐dimensional Cu^II–W^IV polymeric assembly {Cu(en)₂]Cu(en)]W(CN)₈]·4H₂O}_n (en is ethyl­enedi­amine, C₂H₈N₂) or {Cu₂W(CN)₈(C₂H₈N₂)₃]·4H₂O}_n, which can be named as polymeric bis­(ethyl­enedi­amine)copper(II) (ethyl­enedi­amine)copper(II) octa­cyano­tungstate(IV) tetrahydrate or penta‐μ‐cyano‐tri­cyano­tris­(ethyl­enedi­amine)­dicopper(II)­tungsten(IV) tetra­hydrate, consists of two half Cu(en)₂]²⁺ cations (Cu²⁺ on inversion centres), a Cu(en)]²⁺ cation and a W(CN)₈]^4? ion, together with four water mol­ecules. The latter Cu^II site is coordinated by five N atoms from an en ligand and by three cyanides in a distorted square‐pyramidal geometry. The Cu^II atoms of the two Cu(en)₂]²⁺ cations reside in an elongated octahedral coordination environment, and one of them is localized at a centre of inversion. The W atom is coordinated by eight cyano groups in an irregular square antiprism. Five of these act as bridging units connecting the W and the three Cu atoms, to form an infinite three‐dimensional porous network containing a zigzag ladder structure.