“…3d-metal ions, for example, Fe II or Co II , can exhibit magnetic anisotropy that depends on the geometry of the coordination environment [ 10 , 13 , 14 , 15 , 16 , 17 , 18 ]. The choice of 3d-metal undoubtedly affects the anisotropy and magnetic properties of the resulting coordination compounds [ 19 , 20 , 21 ]; however, selection of organic ligands that significantly affect both the structure of compounds and the possibility of exchanges between the metal centers is no less important.…”