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The reaction of CuSO 4 ·5 H 2 O with potassium 2-thiooxamate, K[NH 2 C(S)CO 2 ], yields [Cu(2-thiooxamate)2]·1.6 H 2 O. Crystal data: a = 1501.6(8), b = 1650(1), c = 375.4(2) pm, β = 90.65(5)°, Ζ = 4. The structure was refined with 2213 reflections to R = 0.044. Copper(II) is chelated by two thiooxamate ligands, which act as O- and S-donors forming five-membered chelate rings. This cis-planar [Cu(2-thiooxamate) 2 ] molecules are stacked. The axial coordination sites at copper(II) interact within the stacks with O- and S-donor atoms of neighbouring units. Above 60 K the magnetic susceptibility follows the Curie-Weiss law with antiferromagnetic coupling.

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Struktur und magnetische Eigenschaften von [Cu II (2-thiooxamat) 2 ] · 1,6H 2 O / Structure and Magnetic Properties of [Cu II (2-thiooxamat)2] · 1,6 H 2 O