利用赤道雌性 N4O2 供体配体构建具有零场慢磁弛豫的八配位 Dy(III) 复合物

IF 4 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Structure Pub Date : 2024-11-01 DOI:10.1016/j.molstruc.2024.140572

Rui Liu , Hong Li , Pengfei Tan , Shaojun Zheng , Shu-Yang Chen , Yi-Quan Zhang , Ulli Englert , Lei Chen

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引用次数: 0

摘要

利用赤道性副配体 N,N′-双吡啶-2-基-亚甲基-1,8-二氨基-3,6-二氧杂辛烷（L）和轴向配体五氟苯氧化物（F5PhO-）合成了一种空气稳定的单核 Dy(III) 单分子磁体 [Dy(L)(F5PhO)2](BPh4)（1）。配合物 1 显示出零场慢磁弛豫行为。当施加 200 Oe 的直接磁场时，观察到 1 有两个缓慢的弛豫过程；它们是由分子间偶极相互作用和磁矩反转引起的。额外的磁稀释实验产生了一种具有单一缓慢弛豫和 76(8) K 能量势垒的材料，表明分子间偶极相互作用引起的磁化量子隧道（QTM）被抑制了。

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Construction of an eight-coordinated Dy(III) complex with zero-field slow magnetic relaxation by using an equatorial sexadentate N4O2 donor ligand

An air-stable mononuclear Dy(III) single molecule magnet [Dy(L)(F₅PhO)₂](BPh₄) (1) was synthesized using the equatorial sexadentate ligand N,N′-bis-pyridin-2-yl-methylene-1,8-diamino-3,6-dioxaoctane (L) and the axial ligand pentafluorophenoxide (F₅PhO^-). Complex 1 shows zero-field slow magnetic relaxation behavior. When a 200 Oe direct field was applied, two slow relaxation processes were observed for 1; they are caused by intermolecular dipole interactions and moment reversal. An additional magnetic dilution experiment resulted in a material with a single slow relaxation and an energy barrier of 76(8) K, indicating that quantum tunneling of the magnetization (QTM) induced by intermolecular dipolar interactions was suppressed.

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来源期刊

Journal of Molecular Structure 化学-物理化学

CiteScore

7.10

自引率

15.80%

发文量

2384

审稿时长

45 days

期刊介绍： The Journal of Molecular Structure is dedicated to the publication of full-length articles and review papers, providing important new structural information on all types of chemical species including: • Stable and unstable molecules in all types of environments (vapour, molecular beam, liquid, solution, liquid crystal, solid state, matrix-isolated, surface-absorbed etc.) • Chemical intermediates • Molecules in excited states • Biological molecules • Polymers. The methods used may include any combination of spectroscopic and non-spectroscopic techniques, for example: • Infrared spectroscopy (mid, far, near) • Raman spectroscopy and non-linear Raman methods (CARS, etc.) • Electronic absorption spectroscopy • Optical rotatory dispersion and circular dichroism • Fluorescence and phosphorescence techniques • Electron spectroscopies (PES, XPS), EXAFS, etc. • Microwave spectroscopy • Electron diffraction • NMR and ESR spectroscopies • Mössbauer spectroscopy • X-ray crystallography • Charge Density Analyses • Computational Studies (supplementing experimental methods) We encourage publications combining theoretical and experimental approaches. The structural insights gained by the studies should be correlated with the properties, activity and/ or reactivity of the molecule under investigation and the relevance of this molecule and its implications should be discussed.