Radical-Bridged Heterometallic Single-Molecule Magnets Incorporating Four Lanthanoceniums |
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| Authors: | Dr Peng Zhang Qian-Cheng Luo Dr Zhenhua Zhu Wanrong He Nan Song Junting Lv Xuning Wang Prof Quan-Guo Zhai Prof Yan-Zhen Zheng Prof Jinkui Tang |
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| Institution: | 1. School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an, 710119 China;2. Frontier Institute of Science and Technology (FIST), Xi'an Jiaotong University Xi An Shi, Xi'an, 710054 China;3. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022 China |
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| Abstract: | The syntheses and magnetic properties of organometallic heterometallic compounds K(THF)6]{CoI(μ3-HAN)RE2Cp*4]2} ( 1-RE ) and K(Crypt)]2{CoI(μ3-HAN)RE2Cp*4]2} ( 2-RE ) containing hexaazatrinaphthylene radicals (HAN⋅3−) and four rare earth (RE) ions are reported. 1-RE shows isolable species with ligand-based mixed valency as revealed by cyclic voltammetry (CV) thus leading to the isolation of 2-RE via one-electron chemical reduction. Strong electronic communication in mixed-valency supports stronger overall ferromagnetic behaviors in 2-RE than 1-RE containing Gd and Dy ions. Ac magnetic susceptibility data reveal 1-Dy and 2-Dy both exhibit slow magnetic relaxation. Importantly, larger coercive field was observed in the hysteresis of 2-Dy at 2.0 K, indicating the enhanced SMM behavior compared with 1-Dy . Ligand-based mixed-valency strategy has been used for the first time to improve the magnetic coupling in lanthanide (Ln) SMMs, thus opening up new ways to construct strongly coupled Ln-SMMs. |
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| Keywords: | Heterometallic Lanthanide Mixed Valence Radical Bridge Single Molecule Magnets |
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