Field-induced slow magnetic relaxation of two 1-D compounds containing six-coordinated cobalt(ii) ions: influence of the coordination geometry†,Inorganic Chemistry Frontiers

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Field-induced slow magnetic relaxation of two 1-D compounds containing six-coordinated cobalt(ii) ions: influence of the coordination geometry†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-07-26 00:00:00 , DOI: 10.1039/c8qi00388b
Zhiwei Chen _{1,

2,

3,

4,

5} , Lei Yin _{6,

7,

8,

9} , Xiuna Mi _{1,

2,

3,

4,

5} , Suna Wang _{1,

2,

3,

4,

5} , Fan Cao _{10,

11,

12,

13} , Zhenxing Wang _{6,

7,

8,

9} , Yunwu Li _{1,

2,

3,

4,

5} , Jing Lu _{1,

2,

3,

4,

5} , Jianmin Dou _{1,

2,

3,

4,

5}

Affiliation

Two one-dimensional (1-D) cobalt(II) compounds, namely, {[Co(L1)(2,2′-bipy)]·0.5DMF}_n (1) and {[Co(bimb)(H₂O)₄]·(L2)·2DMF}_n (2) (H₂L1 = 2,2′-[benzene-1,4-diylbis(methanediylsulfanediyl)]dibenzoic acid, H₂L2 = 2,2′-(1,4-phenylenebis(methylene))bis(sulfanediyl)dinicotinic acid, 2,2′-bipy = 2,2′-bipyridine, bimb = 1,4-bis(benzoimidazo-1-ly)benzene), have been synthesized using cobalt(II) salts with long flexible carboxylic acids and N-containing ligands. Compounds 1 and 2 were systematically characterized by elemental analysis, infrared spectroscopy, and single crystal X-ray diffraction analysis. Both compounds display 1-D chain structures with two types of well-separated six-coordinated cobalt(II) ions possessing the same coordination sphere CoO₄N₂ but different coordination geometries: distorted trigonal prism and octahedron, respectively, which lead to different magnetic properties. Compound 1 exhibits more significant frequency-dependent signals and larger field-induced slow relaxation magnetization than compound 2. High frequency electron paramagnetic resonance (HF-EPR) studies further demonstrated the large anisotropy of both compounds with D values of −56.2 and +57.5 cm⁻¹, respectively.

中文翻译：

磁场诱导的两种含有六配位钴（ii）离子的1-D化合物的慢磁弛豫：配位几何的影响†

两个一维（1-D）钴（II）化合物，即{[Co（L1）（2,2'-bipy）]·0.5DMF} _n（1）和{[Co（bimb）（H ₂ O）₄ ]·（L2）·2DMF} _n（2）（H ₂ L1 = 2,2'-[苯-1,4-二基双（甲烷二基硫醚二基）]二苯甲酸，H ₂ L2 = 2,2'-（已合成1,2,4-亚苯基双（亚甲基）双（亚磺酰基二基）二氢古丁酸2,2'-bipy = 2,2'-联吡啶，bimb = 1,4-双（苯并咪唑-1-基）苯使用具有长柔韧性羧酸和含N配体的钴（II）盐。化合物1和2通过元素分析，红外光谱和单晶X射线衍射分析对它们进行了系统地表征。这两种化合物显示1-d链结构使用两种类型的良好分离的六配位钴（II）具有相同的配位离子球体的CoO ₄ Ñ ₂但不同的配位几何形状：扭曲三角棱柱和八面体，分别，这导致不同的磁特性。化合物1所表现出更显著频率相关的信号，以及较大的场致慢松弛磁化比化合物2。高频电子顺磁共振（HF-EPR）研究进一步证明了两种化合物与D的大各向异性值分别为-56.2和+57.5 cm ^-1。

更新日期：2018-07-26

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