Low-dimensional compounds containing cyano groups. XVII. Crystal structure, spectroscopic, thermal and magnetic properties of [Cu(bmen)2][Pt(CN)4] (bmen = N,N´-dimethylethylenediamine)


Low-dimensional compounds containing cyano groups. XVII. Crystal structure, spectroscopic, thermal and magnetic properties of [Cu(bmen)2][Pt(CN)4] (bmen = N,N´-dimethylethylenediamine)

Potocnák, I.; Vavra, M.; Cizmar, E.; Kajnaková, M.; Radváková, A.; Steinborn, D.; Zvyagin, S. A.; Wosnitza, J.; Feher, A.

The synthesis, structural analysis, spectroscopic studies, susceptibility and specific-heat measurements of {[Cu(bmen)2][Pt(CN)4]}n (bmen = N,N'-dimethylethylenediamine) are presented. X-ray crystalstructure analysis revealed that the [Pt(CN)4]2- building blocks are combined with [Cu(bmen)2]2+ units to form a chain-like structure along the a axis. The Cu(II) atoms are hexacoordinated by four nitrogen atoms in the equatorial plane belonging to two molecules of bidentate bmen ligands with average Cu–N distance of 2.043(18) A . The axial positions are occupied by two nitrogen atoms from bridging [Pt(CN)4]2- anions at a longer axial Cu–N distance of 2.490(4) A . The compound is characterized by the presence of a weak antiferromagnetic exchange coupling J/kB = 0.6 K. Despite the one-dimensional (1D) character of the structure, the analysis of the magnetic properties and specific heat at very low temperatures shows that [Cu(bmen)2][Pt(CN)4] behaves as a two-dimensional (2D) square-lattice Heisenberg magnet with weak interlayer coupling.

  • Journal of Solid State Chemistry 182(2009), 196-202

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Publ.-Id: 12665