One-dimensional cobalt(II) coordination polymer featuring single-ion-magnet-type field-induced slow magnetic relaxation

One-dimensional cobalt(II) coordination polymer featuring single-ion-magnet-type field-induced slow magnetic relaxation
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具有单离子磁体型场诱导慢磁弛豫功能的一维钴(II)配位聚合物

DOI:
10.1039/c8nj01236a
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发表时间:
2018-06
期刊:
New J. Chem
影响因子:
--
通讯作者:
Yi-quan Zhang
Yi-quan Zhang
中科院分区:
其他
文献类型:
--
作者:
Xiangyu Liu;Xiufang Ma;Peipei Cen;Fengqin An;Zheng Wang;Weiming Song;Yi-quan Zhang

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将磁性离散的3d过渡金属离子组装成配位网络,形成单离子磁体(SIM)单元,是设计新型单分子磁体(SMM)的一种有效方法。本文合成了一种Co(II)基化合物[Co(3-Hppt)2(adip)(H2O)2]·2 H2O(1),并通过单晶X射线晶体学分析了其结构。标题化合物的结构由良好隔离的一维链的钴(II)离子的八面体金属原子在空间上彼此分开的己二酸桥(Co Co = 11.197 A)。通过分析直流磁数据,得到的化合物呈现负的单轴各向异性参数(D =-33.9 cm-1),这进一步通过从头计算来探测。交流磁化率实验1表现出场诱导的双磁弛豫过程与各向异性的能量势垒为38.8 K的单个离子的Co(II)离子的各向异性。
Organizing magnetically discrete 3d transition metal ions, which behave as single-ion magnet (SIM) units, in a coordination network is a promising approach to design novel single-molecule magnets (SMMs). Herein a Co(II)-based compound of formula [Co(3-Hppt)2(adip)(H2O)2]·2H2O (1), has been prepared and structurally analyzed by single-crystal X-ray crystallography. The structure of the title compound consists of well-isolated one-dimensional chains of Co(II) ions where the octahedral metal atoms are spatially separated from each other by adipic acid bridges (Co⋯Co = 11.197 A). The resulting compound presents a negative uniaxial anisotropy parameter (D = −33.9 cm−1) by the analysis of the direct current magnetic data, which is further probed by ab initio calculations. Alternating-current magnetic susceptibility experiments on 1 exhibit field-induced double magnetic relaxation processes with an anisotropic energy barrier of 38.8 K resulting from the single-ion anisotropy of the individual Co(II) ions.
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