Dithioquadratato-Komplexe von Kupfer(II) und Kupfer(I). / Dithiosquarate Complexes of Copper(II) and Copper(I).
From aqueous solutions of potassium dithiosquarate and bis(ethylenediamino)copper(II) sulfate the following compounds have been obtained: [CuII(en)2][CuII(C4O2S2)2] (2) and [CuII(en)2(H2O)]2[Cu4I(C4O2S2)4] · 2 H2O (3). Their structures have been determined: Crystal data, 2, monoclinic, space group C 2/c, a = 1914.5(6), b = 823.0(1), c = 1669.5(5) pm, β = 133.23(1)°, Ζ = 4; 1809 reflections, R = 0.024. 3, triclinic, a = 779.2(3), b = 958.7(4), c = 1478.8(4) pm, α = 82.34(3), β = 82.68(2), γ = 73.47(3)°, Ζ = 1; 3376 reflections, R = 0.045. 2 contains infinite chains of centrosymmetrical [Cu(en)2]2+ cations and bisphenoidal [Cu(C4O2S2)2]2- anions. 2 shows ferromagnetic behaviour above 75 K. At lower temperatures antiferromagnetic coupling between the chains dominates. 3 contains isolated [Co(en)2H2O]2+ cations and tetrameric [Cu(C4O2S2)]- anions. The anion consists of a chain of tetrahedrally and trigonally coordinated Cu(I) atoms with short Cu · · · Cu distances of 255.2( 1 ) and 257.9( 1 ) pm. The dithiosquarate ligands are stacked in pairs.