Field-induced slow relaxation of magnetization in a distorted octahedral mononuclear high-spin Co(ii) complex†,CrystEngComm

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Field-induced slow relaxation of magnetization in a distorted octahedral mononuclear high-spin Co(ii) complex†
CrystEngComm ( IF 2.6 ) Pub Date : 2018-01-08 00:00:00 , DOI: 10.1039/c7ce01981e
Hai-Wen Wei _{1,

2,

3,

4,

5} , Qing-Feng Yang _{1,

2,

3,

4,

5} , Xiao-Yong Lai _{1,

2,

3,

4,

5} , Xiao-Zhong Wang _{2,

3,

4,

5} , Tian-Lin Yang _{2,

3,

4,

5} , Qin Hou _{4,

6,

7,

8} , Xiang-Yu Liu _{1,

2,

3,

4,

5}

Affiliation

In this study, we report the syntheses and structures of two new mononuclear coordination complexes ([Co(H₂pimdc)₂(phen)]_n (1) and [Fe(H₂pimdc)₂(phen)]_n (2), H₂pimdc = 2-propyl-imidazole-4,5-dicarboxylate, phen = 1,10-phenanthroline monohydrate) exhibiting single-ion magnet (SIM) behavior. Single-crystal X-ray diffraction analyses reveal that 1 and 2 are isomorphic and crystallized in the monoclinic crystal system with the P2₁/n space group. In both structures, the Co(II)/Fe(II) centers adopt distorted octahedral {Co/FeN₄O₂} geometries. In addition, the mononuclear structures of 1 and 2 are linked by strong intermolecular N–H⋯O hydrogen bonds, leading to the formation of a two-dimensional (2D) sheet in which Co(II)/Fe(II) ions are spatially separated from each other. The study of their magnetism reveals that compound 1 presents an easy-plane magnetic anisotropy (D = +3.47 cm⁻¹). Alternating current dynamic susceptibility measurements show that compound 1 exhibits field-induced slow relaxation of the magnetization with an effective energy barrier value of 48.49 K.

中文翻译：

场致畸变的八面体单核高自旋Co（ii）配合物的磁化缓慢弛豫†

在这项研究中，我们报告了两种新的单核配位配合物（[Co（H ₂ pimdc）₂（phen）] _n（1）和[Fe（H ₂ pimdc）₂（phen）] _n（2）的合成和结构。，H ₂ pimdc = 2-丙基-咪唑-4,5-二羧酸盐，phen = 1,10-菲咯啉一水合物）表现出单离子磁体（SIM）行为。X射线单晶衍射分析表明1和2是同构的，并且在具有P 2 ₁ / n空间基团的单斜晶体系统中结晶。在两种结构中，Co（II）/ Fe（II）中心采用扭曲的八面体{Co / FeN ₄ O ₂ }几何形状。此外，1和2的单核结构通过强分子间N–H⋯O氢键连接，从而导致形成二维（2D）薄片，其中Co（II）/ Fe（II）离子在空间上彼此分开。对它们的磁性的研究表明，化合物1表现出易平面的磁各向异性（D = +3.47 cm ^-1）。交流动态磁化率测量表明化合物1 表现出磁场诱导的磁化慢弛豫，有效能垒值为48.49 K.

更新日期：2018-01-08

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