Ligand effect of two Dy(III) complexes on single-molecule magnetism

Abstract The organic ligands (E)-3-(pyridin-2-ylmethyleneamino)propane-1,2-diol (H2L1) and (E)-2-((2,3-dihydroxypropylimino)methyl)quinolin-8-ol (H3L2) were reacted with Dy(NO3)3·6H2O at 80 °C to obtain the binuclear complex [Dy2(HL1)2(NO3)4] (1) and the trinuclear complex [Dy3(HL2)3(OH)(H2O)(CH3OH)2](NO3)2·CH3CN (2), where the H2L1 and H3L2 ligands were obtained from picolinaldehyde or 8-hydroxyquinoline-2-carbaldehyde and 3-aminopropane-1,2-diol by an in-situ reaction. Magnetic investigations showed that complex 1 exhibited field-induced single-molecule magnetic behavior with an energy barrier of 4.65(6) K under a 1200 Oe field. By contrast, complex 2 was a clear single-molecule magnet, with energy barriers of 7.7(2) and 25.2 (3) K under different dc-fields.