Yi Gangji, Zhang Chunyang, Zhao Wen, Cui Huihui, Chen Lei, Wang Zhenxing, Chen Xue-Tai, Yuan Aihua, Liu Yuan-Zhong, Ouyang Zhong-Wen
School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, P. R. China.
State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China.
Dalton Trans. 2020 Jun 9;49(22):7620-7627. doi: 10.1039/d0dt01232g.
A series of mononuclear seven-coordinate Co(ii) complexes CoII(BPA-TPA)2·H2O (2-ClO4), CoII(BPA-TPA)2 (3-PF6) and CoII(BPA-TPA)2 (4-BPh4) have been synthesized based on the ligand 2,6-bis(bis(2-pyridylmethyl)amino)methylpyridine (BPA-TPA), and their structures have been characterized by single-crystal X-ray diffraction. All these complexes feature an intermediate coordination polyhedron between a capped trigonal prism and a capped octahedron, which is perturbed by the variation of the counter anions. Easy-plane magnetic anisotropies for all complexes were revealed via the analyses of the direct-current magnetic data and high-field electron paramagnetic resonance (HFEPR) spectra. They show slow magnetic relaxation under applied direct current field, which is similar to the previously reported complex CoII(BPA-TPA)2 (1-BF4) with a capped trigonal prism. This work provides a new example of modulating the properties of single-ion magnets (SIMs) by changing the counter anions.
基于配体2,6-双（双（2-吡啶甲基）氨基）甲基吡啶（BPA-TPA）合成了一系列单核七配位Co（II）配合物CoII（BPA-TPA）2·H2O（2-ClO4）、CoII（BPA-TPA）2（3-PF6）和CoII（BPA-TPA）2（4-BPh4），并通过单晶X射线衍射对其结构进行了表征。所有这些配合物的特征是在盖帽三棱柱和盖帽八面体之间存在中间配位多面体，其受到抗衡阴离子变化的扰动。通过对直流磁数据和高场电子顺磁共振（HFEPR）光谱的分析，揭示了所有配合物的易面磁各向异性。它们在施加的直流磁场下表现出缓慢的磁弛豫，这与先前报道的具有盖帽三棱柱结构的配合物CoII（BPA-TPA）2（1-BF4）相似。这项工作提供了一个通过改变抗衡阴离子来调节单离子磁体（SIMs）性质的新例子。
