Details

Autor(en) / Beteiligte

• Wang, Xia
• Wang, Ling-Yun
• Wu, Su-Yun
• Ou, Li-Juan
• Yang, Guo-Ping

Titel

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

Ist Teil von

• Polyhedron, 2020-07, Vol.184, p.114553, Article 114553

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2020

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• Two different Dy(III) complexes which act as SSMs have been synthesized by regulating the N,O chelating ligands. Comparing the two SMMs, because there is an additional oxygen coordination site on the ligand in the structure of complex 2 to coordinate with Dy(III) ions, this leads to the structure going from the binuclear for complex 1 to trinuclear for complex 2, resulting in a huge difference in the ac magnetic susceptibilities between the two complexes. [Display omitted] 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.