首页|Strong Antiferromagnetic Exchange-Coupling Observed in Hydride-Bridged Dimeric Dysprosium(Ⅲ)Single-Molecule Magnet

Strong Antiferromagnetic Exchange-Coupling Observed in Hydride-Bridged Dimeric Dysprosium(Ⅲ)Single-Molecule Magnet

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One dihydride-bridged dimeric Dy(Ⅲ)guanidinate complex,formulated as[{(Me3Si)2NC(NiPr)2}2Dy(μ-H)]2(1Dy),was successfully iso-lated and the introduction of hydride bridges significantly reduces the intramolecular Dy(Ⅲ)…Dy(Ⅲ)distance to only 3.688(1)Å.To in-vestigate the effect of such a short Dy(Ⅲ)…Dy(Ⅲ)distance on magnetism,we also prepared its dibromide-bridged analogue[{(Me3Si)2NC(NiPr)2}2Dy(μ-Br)]2(2Dy),which has a much longer Dy(Ⅲ)…Dy(Ⅲ)distance of 4.605(4)Å.Surprisingly,2Dy demonstrates much larger effective energy barrier for magnetization reversal(Ueff)and higher blocking temperature(TB).The worse performance of 1Dy is attributed to the concerted effect of strong antiferromagnetic interactions between Dy(Ⅲ)ions(Jtotal=-2.683 cm-1)and the unparallel arrangement of magnetic principle axes of the Dy(Ⅲ)ions for 1Dy.

Single-molecule magnetsLanthanidesGuanidinate ligandHydride bridgeMagnetic propertiesAb initio calculations

Qian-Cheng Luo、Ke-Xin Yu、Peng-Bo Jin、Ye-Ye Liu、Yuan-Qi Zhai、Yan-Zhen Zheng

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Frontier Institute of Science and Technology,State Key Laboratory of Electrical Insulation and Power Equipment,Xi'an Key Laboratory of Electronic Devices and Materials Chemistry,School of Chemistry and School of Physics,Xi'an Jiaotong University,99 Yanxiang Road,Xi'an,Shaanxi 710054,China

国家自然科学基金Key Scientific and Technological Innovation Team of Shaanxi ProvinceJoint Fund for Regional Innovation and Development中央高校基本科研业务费专项

219712032020TD-001U20A2073

2024

10.1002/cjoc.202300491

中国化学(英文版)
中国化学会 上海有机化学研究所

中国化学(英文版)

CSTPCD
影响因子：0.848
ISSN：1001-604X
年,卷(期)：2024.42(4)
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