顺磁CuII和反磁nii离子对显示缓慢磁化弛豫的异双核3d-4f配合物单分子磁性的影响

IF 2.5 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Rakhi Nandy, Narayan Ch. Jana, Marko Jagodič, Zvonko Jagličić, Paula Brandão, Amrita Saha and Anangamohan Panja
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引用次数: 0

摘要

自从在CuII-TbIII体系中缓慢弛豫磁化的突破性工作以来,3d-4f单分子磁体(SMMs)的研究领域引起了人们的广泛关注。在这篇报道中,我们提出了三个新的同构和同形的配合物[CuLn(L)(NO3)3(H2O)] (Ln = Gd (1), Tb(2)和Dy(3)),由室室希夫碱配体H2L衍生而来。为了进一步揭示磁性动力学,我们还开发了两个密切相关的ni - dyiii配合物,[ZnDy(L)(NO3)3(py)](4)和[ZnDy(L)(OAc)(piv)(NO3)](5),其中py、OAc和piv分别代表吡啶、醋酸盐和私人酸盐离子。这些配合物为探索顺磁性CuII和反磁性ni离子对动态磁性行为的影响提供了机会。磁化率测量表明,配合物4和5中DyIII离子的Stark亚能级失居效应占主导地位,同时在1-3中CuII离子和各自的LnIII离子之间存在明显的铁磁相互作用,通常在≥4f7离子中观察到。有趣的是,所有合成的配合物在外加磁场的作用下都表现出动态的磁性行为,这表明CuII离子的铁磁性影响和来自ni离子的电荷极化在形成其磁性能方面起着至关重要的作用。本研究最重要的成果是,尽管GdIII离子具有各向同性的性质,但在配合物1中观察到场诱导的磁化缓慢弛豫。考虑到显示单分子磁铁行为的CuII-GdIII系统的稀缺性,这项工作为基于gdiii的smm的不断扩大的领域增加了显着的贡献,提供了新的见解,拓宽了这一有前途的领域的未来研究视野。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Impact of paramagnetic CuII and diamagnetic ZnII ions on single-molecule magnetism in heterodinuclear 3d–4f complexes displaying slow relaxation of magnetization†

Impact of paramagnetic CuII and diamagnetic ZnII ions on single-molecule magnetism in heterodinuclear 3d–4f complexes displaying slow relaxation of magnetization†

The fascinating field of 3d–4f single-molecule magnets (SMMs) has gained considerable attention since the breakthrough work of slow relaxation of magnetization in a CuII–TbIII system. In this report, we present the synthesis of three new isostructural and isomorphous [CuLn(L)(NO3)3(H2O)] complexes (Ln = Gd (1), Tb (2), and Dy (3)), derived from a compartmental Schiff base ligand, H2L. To further unravel the magnetic dynamics, we also developed two closely related ZnII–DyIII complexes, [ZnDy(L)(NO3)3(py)] (4) and [ZnDy(L)(OAc)(piv)(NO3)] (5), with py, OAc, and piv representing pyridine, acetate, and pivalate ions, respectively. These complexes offer an opportunity to explore the influence of paramagnetic CuII and diamagnetic ZnII ions on dynamic magnetic behaviors. Magnetic susceptibility measurements indicate a dominant Stark sublevel depopulation effect for the DyIII ions in complexes 4 and 5, alongside pronounced ferromagnetic interactions between the CuII ion and the respective LnIII ions in 1–3, as commonly observed for ≥4f7 ions. Intriguingly, all synthesized complexes exhibit dynamic magnetic behavior in the presence of an applied magnetic field, indicating that the ferromagnetic influence of CuII ions and the charge polarization from the ZnII ion play crucial roles in shaping their magnetic properties. The most important achievement of this study is the observation of field-induced slow relaxation of magnetization in complex 1, despite the isotropic nature of the GdIII ion. Given the scarcity of CuII–GdIII systems demonstrating single-molecule magnet behavior, this work adds a remarkable contribution to the expanding field of GdIII-based SMMs, offering fresh insights and broadening the horizons of future research in this promising area.

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来源期刊
New Journal of Chemistry
New Journal of Chemistry 化学-化学综合
CiteScore
5.30
自引率
6.10%
发文量
1832
审稿时长
2 months
期刊介绍: A journal for new directions in chemistry
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