Synthesis and characterization of cyano-bridged polynuclear [Cu(dmpn)(2)](3)[Co(CN)(6]2)center dot 12H(2)O and trinuclear [Cu(dmpn)(2]2)[Co(CN)(6)]center dot ClO4 center dot 3H(2)O complexes

Two new heteronuclear bimetallic assemblies [Cu(dmpn)(2)](3)[Co(CN)(6)](2). 12H(2)O (1) and [Cu(dmpn)(2)](2)[Co(CN)(6)]. ClO4. 3H(2)O (2) have been pr epared and crystal structures have been solved. The one-dimensional (1D) po lymeric chain of 1 extended through Co-CN-Cu-NC-Co linkages. The chains are finally linked by hydrogen bonds giving rise to a unique step shaped two-d imensional (2D) network. In the crystal of 1, all the copper(II) and cobalt (III) ions have distorted octahedral geometry. In the complex 2, the copper (II) and cobalt(III) centres are linked together through cyano-bridges and both the copper(II) ions have a distorted square pyramidal geometry. Of the six CN- groups around the cobalt atom in complex 2, two coordinate to copp er atoms of adjacent [Cu(dmpn)(2)](2+) moieties leading a non-linear trinuc lear unit, of the remaining four CN- groups two are free and the other two interact through hydrogen bonds with water molecules present in each asymme tric unit. The presence of water molecules gives rise to an extensive H-bon ded molecular assembly. (C) 2001 Elsevier Science B.V. All rights reserved.