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Molecular assemblies based on tricyanomethanide units and copper(II) ions

Abstract : New co-ordination polymers of formulae [Cu(tcm)2(tn)] (1) and [Cu(tcm)(tn)2](tcm) (2) (tcm-=tricyanomethanide and tn=1,3-diaminopropane) have been synthesised and characterised by X-ray crystallography and magnetic measurements. For compound 1, the Cu(II) ion presents an elongated and distorted CuN4N1N1 octahedron generated by one chelating tn ligand and by four μ 2-bridging tcm- ligands. The molecular arrangement of 1 can be described as a monodimensional chain of a ladder-like structure in which the Cu⋯Cu distance (7.5157(4) Å) through the tcm- ligand forming the sides is significantly shorter than the corresponding distance observed through that providing the rung (7.7455(4) Å). For compound 2, the Cu(II) ion presents a centrosymmetric elongated CuN 4N2 octahedron; the equatorial plane is generated by two chelating tn ligands and the two axial positions are filled by two weakly co-ordinated equivalent tcm- units acting as μ2- bridging ligands. This leads to a monodimensional polymer in which the intrachain Cu⋯Cu distance is 9.1062(2) Å. Magnetic measurements, performed in the temperature range 2-300 K for both compounds, show weak antiferromagnetic interactions for compound 1 while compound 2 obeys a Curie law. The difference between the magnetic behaviours can be explained from the larger intrachain Cu⋯Cu separation in 2 than in 1. © 2003 Elsevier Science B.V. All rights reserved.
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https://hal.univ-brest.fr/hal-01763910
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Submitted on : Wednesday, April 11, 2018 - 2:59:43 PM
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Franck Thétiot, Smail Triki, J.S. Pala, S. Golhen. Molecular assemblies based on tricyanomethanide units and copper(II) ions. Inorganica Chimica Acta, Elsevier, 2003, 350, pp.314-320. ⟨10.1016/S0020-1693(02)01562-1⟩. ⟨hal-01763910⟩

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