Single-molecule magnet involving strong exchange coupling in terbium(iii) complex with 2,2′-bipyridin-6-yl tert-butyl nitroxide†
A novel terbium(III)-radical complex [TbIII(hfac)3(6bpyNO)] (Tb-6bpyNO; 6bpyNO = 2,2′-bipyridin-6-yl tert-butyl nitroxide) was synthesized. The intramolecular antiferromagnetic interaction in Tb-6bpyNO was confirmed by comparison with the magnetic properties of [TbIII(hfac)3(6bpyCO)] (Tb-6bpyCO; 6bpyCO = 2,2′-bipyridin-6-yl tert-butyl ketone) together with [YIII(hfac)3(6bpyNO)]. Tb-6bpyNO showed a hysteresis loop with negligible coersivity below 1.6 K. The dispersion of the magnetic susceptibility with an applied bias field of 2000 Oe gave the energy barrier Ea/kB = 21.1(8) K. In contrast, Tb-6bpyCO did not behave as a single-molecule magnet, despite having practically the same crystal field.
- This article is part of the themed collection: Molecular Magnetism themed collection