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

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

doi:10.1002/cjoc.202300491

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

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

School of Materials Science and Engineering

Xi'an Jiaotong University

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

One dihydride-bridged dimeric Dy(III) guanidinate complex, formulated as [{(Me₃Si)₂NC(NⁱPr)₂}₂Dy(μ-H)]₂ (1Dy), was successfully isolated and the introduction of hydride bridges significantly reduces the intramolecular Dy(III)···Dy(III) distance to only 3.688(1) Å. To investigate 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 (U_eff) and higher blocking temperature (T_B). The worse performance of 1Dy is attributed to the concerted effect of strong antiferromagnetic interactions between Dy(III) ions (J_total = –2.683 cm^–1) and the unparallel arrangement of magnetic principle axes of the Dy(III) ions for 1Dy.

Original language	English
Pages (from-to)	391-396
Number of pages	6
Journal	Chinese Journal of Chemistry
Volume	42
Issue number	4
DOIs	https://doi.org/10.1002/cjoc.202300491
State	Published - 15 Feb 2024

Keywords

Ab initio calculations
Guanidinate ligand
Hydride bridge
Lanthanides
Magnetic properties
Single-molecule magnets

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10.1002/cjoc.202300491

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

abstract = "One dihydride-bridged dimeric Dy(III) guanidinate complex, formulated as [\{(Me3Si)2NC(NiPr)2\}2Dy(μ-H)]2 (1Dy), was successfully isolated and the introduction of hydride bridges significantly reduces the intramolecular Dy(III)···Dy(III) distance to only 3.688(1) {\AA}. To investigate 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) {\AA}. 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.",

keywords = "Ab initio calculations, Guanidinate ligand, Hydride bridge, Lanthanides, Magnetic properties, Single-molecule magnets",

author = "Luo, \{Qian Cheng\} and Yu, \{Ke Xin\} and Jin, \{Peng Bo\} and Liu, \{Ye Ye\} and Zhai, \{Yuan Qi\} and Zheng, \{Yan Zhen\}",

note = "Publisher Copyright: {\textcopyright} 2023 SIOC, CAS, Shanghai, \& WILEY-VCH GmbH.",

year = "2024",

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doi = "10.1002/cjoc.202300491",

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TY - JOUR

T1 - Strong Antiferromagnetic Exchange-Coupling Observed in Hydride-Bridged Dimeric Dysprosium(III) Single-Molecule Magnet

AU - Luo, Qian Cheng

AU - Yu, Ke Xin

AU - Jin, Peng Bo

AU - Liu, Ye Ye

AU - Zhai, Yuan Qi

AU - Zheng, Yan Zhen

PY - 2024/2/15

Y1 - 2024/2/15

N2 - One dihydride-bridged dimeric Dy(III) guanidinate complex, formulated as [{(Me3Si)2NC(NiPr)2}2Dy(μ-H)]2 (1Dy), was successfully isolated and the introduction of hydride bridges significantly reduces the intramolecular Dy(III)···Dy(III) distance to only 3.688(1) Å. To investigate 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.

AB - One dihydride-bridged dimeric Dy(III) guanidinate complex, formulated as [{(Me3Si)2NC(NiPr)2}2Dy(μ-H)]2 (1Dy), was successfully isolated and the introduction of hydride bridges significantly reduces the intramolecular Dy(III)···Dy(III) distance to only 3.688(1) Å. To investigate 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.

KW - Ab initio calculations

KW - Guanidinate ligand

KW - Hydride bridge

KW - Lanthanides

KW - Magnetic properties

KW - Single-molecule magnets

UR - https://www.scopus.com/pages/publications/85176734218

U2 - 10.1002/cjoc.202300491

DO - 10.1002/cjoc.202300491

M3 - 文章

AN - SCOPUS:85176734218

SN - 1001-604X

VL - 42

SP - 391

EP - 396

JO - Chinese Journal of Chemistry

JF - Chinese Journal of Chemistry

IS - 4

ER -

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

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