Coligand effects on the architectures and magnetic properties of octahedral cobalt(II) complexes with easy-axis magnetic anisotropy,CrystEngComm

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Coligand effects on the architectures and magnetic properties of octahedral cobalt(II) complexes with easy-axis magnetic anisotropy
CrystEngComm ( IF 2.6 ) Pub Date : 2020/02/21 , DOI: 10.1039/c9ce01871a
Yuewei Wu _{1,

2,

3,

4,

5} , Jing Xi _{1,

2,

3,

4,

5} , Jinhui Yang _{1,

2,

3,

4,

5} , Weiming Song _{1,

2,

3,

4,

5} , Shuchang Luo _{6,

7,

8,

9} , Zheng Wang _{1,

2,

3,

4,

5} , Xiangyu Liu _{1,

2,

3,

4,

5}

Affiliation

Two mononuclear azido–cobalt(II) complexes, with the formulas [Co(3,3-Hbpt)₂(N₃)₂(H₂O)₂] (1) and [Co(abpt)₂(N₃)₂]·H₂O (2) (3,3-Hbpt = 1H-3,5-bis(3-pyridyl)-1,2,4-triazole; abpt = 4-amino-3,5-bis(2-pyridyl)-1,2,4-triazole), have been prepared by altering the pyridyl-triazole coligands. In both complexes, the Co(II) centers feature hexa-coordinated environments with distorted octahedra in which the axial sites are identical, whereas the equatorial environments are finely modulated by the distinct chemical nature of the different coligands. It is worth noting that the distinct intermetallic distances in the two complexes (10.302 Å for 1 and 6.576 Å for 2) unambiguously cause a disparity in intermolecular interactions, implying their dissimilar magnetic behaviours. As a result, alternating current dynamic susceptibility measurements show that only 2 exhibits field-induced slow relaxation of magnetization with an effective energy barrier of 11.29 K, though large easy-axis magnetic anisotropies for both complexes are unveiled by combined analyses of the magnetic data and ab initio calculations.

中文翻译：

配体对具有易轴磁各向异性的八面体钴（II）配合物的结构和磁性的影响

两种单核叠氮基-钴（II）配合物，其分子式为[Co（3,3-Hbpt）₂（N ₃）₂（H ₂ O）₂ ]（1）和[Co（abpt）₂（N ₃）₂ ]·H ₂ O（2）（3,3-Hbpt = 1 H -3,5-双（3-吡啶基）-1,2,4-三唑; abpt = 4-氨基-3,5-双（2 -吡啶基）-1,2,4-三唑）是通过改变吡啶基-三唑大分子配体制备的。在两个复合物中，Co（II）中心具有扭曲的八面体的六配位环境，其中轴向位置相同，而赤道环境受到不同大肠菌素独特化学性质的精细调节。值得注意的是，两个配合物中的金属间距离（1为10.302Å和2为6.576Å ）明确地引起了分子间相互作用的差异，这意味着它们的磁行为不同。结果，交流电动态磁化率测量结果表明，只有两种磁化场表现出磁场诱导的磁化慢弛豫，有效能垒为11.29 K，尽管两种配合物的大易轴磁各向异性都通过对磁数据和从头算起。

更新日期：2020-03-30

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