Magneto-Structural Correlations in $Cu(en)_2SO_4$ - a new Magnet with Two-Dimensional Triangular Arrangement of Cu(II) ions

$Cu(en)_2SO_4$ (en = 1, 2-diaminoethane) was synthesized and its crystal structure determined. From a crystallographic point of view, the compound might represent an example for the realization of a S =1/2 Heisenberg magnet on a two-dimensional spatially anisotropic triangular lattice. Magnetic susceptibility and magnetization studies were performed to analyze the magneto-structural correlations and to characterize the magnetic subsystem of the present compound. The results indicate the presence of antiferromagnetic interactions between magnetic ions with zJ/$k_B$≈-14.6 K and short-range order near 7 K.