Structure and magnetic properties of 3d–4f heterometallic complexes containing di-2-pyridyl ketoximate: An approach to single-molecule magnets

[{Ln(hfac)3}2{Ni(dpk)2(phen)}] (1Ln) and [{Ln(hfac)3}2{Ni(dpk)2(py)2}] (2Ln) were synthesized and characterized, where dpk = di-2-pyridyl ketoxmate and Ln = La, Tb, Dy, Ho, Er. The N–O groups from dpk bridged the central nickel(II) ion and terminal lanthanide(III) ions, giving a linear trinuclear array. Dc magnetic susceptibility measurements revealed that they did not possess appreciable intramolecular ferromagnetic or ferrimagnetic interaction. Ac magnetic susceptibility measurements clarified that frequency dependence of out-of-phase ac susceptibility was observed only for Dy derivatives 1Dy and 2Dy, which is regarded as an indication of single-molecule magnets.

The N–O groups from di-2-pyridyl ketoxmate bridged the central nickel(II) ion and terminal lanthanide(III) ions, giving a linear trinuclear array (Ln = La, Tb, Dy, Ho, Er). Ac magnetic susceptibility measurements revealed the frequency dependence of out-of-phase ac susceptibility only for the Dy derivatives, which is regarded as an indication of single-molecule magnets.Figure optionsDownload as PowerPoint slide