Acta Cryst. (2006). E62, m750-m752  [ doi:10.1107/S1600536806008105 ]

Bis(N-ethylethylenediamine-²N,N')copper(II)-hexacyanocobaltate(III)-water (3/2/4): a two-dimensional ladder structure of a bimetallic assembly

T. Akitsu and Y. Einaga

Abstract: The title compound, poly[[tetracyano-octa--cyano-hexakis(N-ethylethylenediamine)tricopper(II)dicobaltate(III)] tetrahydrate], [Cu(C₄H₁₂N₂)₂]₃[Co(CN)₆]₂·4H₂O or {[Cu₃Co₂(CN)₁₂(C₄H₁₂N₂)₆]·4H₂O}_n, was crystallized from an aqueous reaction mixture containing Cu(ClO₄)₂, N-ethylethylenediamine and K₃[Co(CN)₆] in a self-assembling process. The polymeric chains are extended through -Co^III-CN-Cu^II- linkages involving four or two cyanide ligands of the centrosymmetric [Co(CN)₆]^3- complex ions, forming a two-dimensional ladder structure. The Cu^II atoms, one of which also lies on an inversion centre, have a distorted octahedral coordination geometry, the degree of tetragonal Jahn-Teller distortion being T = 0.785 and 0.810 (T is the ratio of mean in-plane Cu-N bond lengths to axial Cu-N bond lengths). This local Jahn-Teller distortion results from the anisotropic features of this two-dimensional cyano-bridged structure.

Online 15 March 2006

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