Abstract
Stable radical-substituted chelate type ligands are interesting spin-building blocks for organic-inorganic composite magnetic materials. Here, we designed and synthesized the imino nitroxide-introduced phenol as such a ligand and prepared the Cu(II) complex and studied the magnetic properties of the complex.The geometry around the coordinated Cu(II) ion was not complete square planar and the dihedral angle between two N-Cu-O planes was 36.7°.The bond distance are 1.93, 1.89 Å and 1.92, 2.06 Å for the Cu-nitrogen and Cu-oxygen bonds, respectively. Magnetic susceptibility was measured by SQUID. The χpT value at room temperature is 1.68 emuKmol -1 and gradually increased as temperature decreased down to 130K, indicating the presence of relatively strong ferromagnetic interaction between two imino nitroxides and the Cu ion. Under 120K, χ pT value decreased. When the complex was diluted in PVC film, the χ pT value was almost constant down to 1.9 K, indicating that the antiferromagnetic interaction is due to the intrermolecular magnetic interaction. The analaysis using trimer model indicates is J~= +250 K and θ~ -17 K for the ferromagnetic interaction between Cu(II) and imino nitroxides and the possible intermolecular interaction,respectively.We are now preparing an extended chain structured complex using bis (imino nitroxide) substituted resorcinol.
