镝
化学
反铁磁性
结晶学
分子内力
氢化物
离子
单分子磁体
磁性
磁化
分子
立体化学
无机化学
凝聚态物理
氢
磁场
物理
有机化学
量子力学
作者
Qian‐Cheng Luo,Kunpeng Yu,Peng‐Bo Jin,Yeye Liu,Yuan‐Qi Zhai,Yan‐Zhen Zheng
标识
DOI:10.1002/cjoc.202300491
摘要
Comprehensive Summary One dihydride‐bridged dimeric Dy(III) guanidinate complex, formulated as [{(Me 3 Si) 2 NC(N i Pr) 2 } 2 Dy( 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 [{(Me 3 Si) 2 NC(N i Pr) 2 } 2 Dy( 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 .
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