[Cu(en)2]2+- [W(CN)6(bpy)]2- interactions in cyanido bridged and not linked complexes - structural study

Five heterobimetallic Cu(II)-W(IV) complexes with the general formulas [Cu(en)(2)][W(CN)(6)(bpy)], {[Cu(en)(2)][W(CN)(6)(bpy)]}(2)center dot[Cu(en)(2)(H2O)(2)]X-2 (where X = Cl or Br), Na4K2[Cu(en)(2)][W(CN)(6)(bpy)](4), Li-2[Cu(en)(2)(H2O)(2)][W(CN)(6)(bpy)](2) were synthesized and described by elemental analyses, magnetic measurements, IR and UV-Vis spectra, as well as the single crystal X-ray structure measurements. In structures, the copper atoms adopt the geometry of a slightly distorted octahedron. The effect of the addition of a halogen or alkali metal on the different modes of cyanide bridging in all structures was discussed. These results provide an important contribution to the knowledge on the controllable synthesis of coordination networks based on cyanide bridges.