Magnetic properties and structure of a Cu IIDy III heterodinuclear Schiff base complex

Abstract

The crystal structure of a new heterodinuclear lanthanide complex, L 2Cu(Me 2CO)Dy(NO 3) 3 (L 2= N, N′-bis(2-hydroxy-3-methoxy-benzylidene)-ethylenediamine) has determined and the magnetic properties of the complex investigated. (C 18H 18N 2O 4)Cu(C 3H 6O)Dy(NO 3) 3, monoclinic, space group P2 1/ c, with a=9.875(2), b=18.870(7), c=15.675(8) Å, β=95.45(3)°, V=2908(2) Å 3, Z=4. The structure consists of ordered dinuclear units with Cu II and Dy III ions bridged by two phenolato oxygen atoms of the Schiff base ligand. The Cu II ion has a square-pyramidal geometry involving the basal N 2O 2 donor atoms of the Schiff base ligands and one oxygen atom of the acetone molecule at the apex position. The Dy III ion is decacoordinated by the four oxygen atoms of L 2 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 Cu IIDy III 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 Dy III site, masking the magnetic interaction between the paramagnetic centers.