Slow magnetic relaxation in a novel carboxylate/oxalate/hydroxyl bridged dysprosium layer.
Slow magnetic relaxation in a novel carboxylate/oxalate/hydroxyl bridged dysprosium layer.
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DOI：
10.1039/c5sc00491h
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发表时间：
2015-05-01
期刊：
影响因子：
8.4
通讯作者：
Gao S
中科院分区：
文献类型：
--
作者：
Yin DD;Chen Q;Meng YS;Sun HL;Zhang YQ;Gao S
本文报道了一种二维镝配合物，它表现出缓慢的磁弛豫，这是由于单个Dy ~（3+）离子的强伊辛各向异性引起的。通过与2-（3-吡啶基）嘧啶-4-羧酸（H3-py-4-pmc）反应，成功地合成了一种新型的二维镝层状化合物，其中Dy 3+离子位于正方形反棱柱配位环境中，通过羧酸根/草酸根/羟基桥连接。磁性研究揭示Dy 3+离子之间的铁磁相互作用，缓慢的磁弛豫与有效的能量势垒Ueff为186 K下零直流场和明显的磁滞回线在低温下。进一步的稀释磁性研究表明，这种慢磁弛豫源于Dy ~（3+）离子的单离子磁性行为，低温下磁耦合抑制了磁化强度的量子隧穿。此外，理论计算表明Dy 3+离子具有很强的Ising各向异性，这是由于Dy 3+离子与羟基之间存在很强的相互作用。
2D dysprosium complex exhibiting slow magnetic relaxation originating from the strong Ising anisotropy of single Dy3+ ions has been reported. A new 2D dysprosium layer compound has been successfully synthesized from reaction with 2-(3-pyridyl) pyrimidine-4-carboxylic acid (H3-py-4-pmc), in which the Dy3+ ions reside in square antiprismatic coordination environments and are connected by carboxylate/oxalate/hydroxyl bridges. Magnetic studies reveal ferromagnetic interactions between Dy3+ ions, slow magnetic relaxation with an effective energy barrier U eff of 186 K under zero dc field and pronounced hysteresis loops at low temperatures. Further dilution magnetic study suggests that the slow magnetic relaxation originates from the single-ion magnetic behavior of Dy3+ ion and that magnetic coupling suppresses the quantum tunneling of magnetization at low temperature. In addition, theoretical calculation indicates strong Ising anisotropy of the Dy3+ ion that is due to the strong interaction between Dy3+ ions and hydroxyl groups.