Email Post: catena-Poly[[[μ-cyanido-1:2κ(2) C:N-tricyanido-1κ(3) C-bis(ethylenediamine)-2κ(4) N,N′-copper(II)iron(II)]-μ-cyanido-κ(2) C:N-[bis(ethylenediamine-κ(2) N,N′)copper(II)]-μ-cyanido-κ(2) N:C] 4.5-hy­drate]