1. Synthesis, crystal structure and magnetic properties of octanuclear Ni4Ln4 complexes constructed using a Schiff base ligand and di-2-pyridyl ketone.
- Author
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Zhu, Yu-Jie, Wang, Hui-Sheng, Chen, Yuxiang, Zhou, Pengfei, Wu, Yanfang, and Zhang, Yi-Quan
- Subjects
SINGLE molecule magnets ,MAGNETIC properties ,KETONES ,CRYSTAL structure ,MAGNETIC relaxation ,SCHIFF bases ,TRIMETHYLAMINE oxide ,COORDINATION polymers - Abstract
Synthesis of 3d–4f single molecule magnets (SMMs) with novel topologies and exploration of the magnetic relaxation mechanism of SMMs have continuously received considerable attention because high performance SMMs could be obtained. In this work, we selected N-3-methoxysalicylidene-2-amino-3-hydroxypyridine (H
2 L) and di-2-pyridyl ketone (dpk) for reaction with Ni(NO3 )2 ·6H2 O, Dy(NO3 )3 ·5H2 O and trimethylamine in a CH3 OH solution, and a novel Ni4 Dy4 complex, [Ni4 Dy4 (L)6 (L′)2 {(py)2 C(OCH3 )O}2 (μ3 -CO3 )2 (CH3 OH)2 ]·10CH3 OH·13H2 O (1, (py)2 C(OCH3 )(OH) = the hemiacetal form of dpk), was obtained. The magnetic diluted complex, [Ni4 Y3.91 Dy0.09 (L)6 (L′)2 {(py)2 C(OCH3 )O}2 (μ3 -CO3 )2 (CH3 OH)2 ]·10CH3 OH·12H2 O (2), and the Y analogue of 1, [Ni4 Y4 (L)6 (L′)2 {(py)2 C(OCH3 )O}2 (μ3 -CO3 )2 (CH3 OH)2 ]·10CH3 OH·11H2 O (3), were also obtained. The carbonate ions in 1–3 were formed by spontaneous fixation of atmospheric CO2 . Structural analysis revealed that the metallic core in 1 can be viewed as a Ni2 Dy2 butterfly connecting two NiDy subunits on each side. To our knowledge, the structural topologies of 1–3 were not reported previously. The magnetic susceptibilities of 3 were fitted by PHI, indicating that the magnetic coupling between Ni1 and Ni1a in the "Ni2 Y2 butterfly" subunit of 3 is ferromagnetic. Alternating-current (ac) susceptibility studies revealed that 1–2 exhibit single molecule magnet behavior under a zero dc field. [ABSTRACT FROM AUTHOR]- Published
- 2024
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