Magnetic properties and structure of a CuIIDyIII heterodinuclear Schiff base complex

The crystal structure of a new heterodinuclear lanthanide complex, L2Cu(Me2CO)Dy(NO3)3 (L2=N,N′-bis(2-hydroxy-3-methoxy-benzylidene)-ethylenediamine) has determined and the magnetic properties of the complex investigated. (C18H18N2O4)Cu(C3H6O)Dy(NO3)3, monoclinic, space group P21/c, with a=9.875(2), b=18.870(7), c=15.675(8) Å, β=95.45(3)°, V=2908(2) Å3, Z=4. The structure consists of ordered dinuclear units with CuII and DyIII ions bridged by two phenolato oxygen atoms of the Schiff base ligand. The CuII ion has a square-pyramidal geometry involving the basal N2O2 donor atoms of the Schiff base ligands and one oxygen atom of the acetone molecule at the apex position. The DyIII ion is decacoordinated by the four oxygen atoms of L2 and six oxygen atoms from the three bidentate nitrate ions. The Cu⋯Dy separation is 3.461(2) Å. The χT versus T plots, χ being the molar magnetic susceptibility per CuIIDyIII unit and T the temperature, has been measured in the 4.5-300 K temperature range. The magnetic properties of the compound are dominated by the crystal field effect on the DyIII site, masking the magnetic interaction between the paramagnetic centers.