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新型具有双μ-苯氧基桥联的双核钴(II)配合物的磁结构相关性研究

Study on the Magneto-Structural Correlation of a New Dinuclear Cobalt(II) Complex with Double μ-Phenoxo Bridges.

作者信息

Song Xiao-Jiao, Xue Xiao-Ming

机构信息

Key Laboratory of National Forestry and Grassland Administration on Wildlife Evidence Technology, School of Criminal Science and Technology, Nanjing Forest Police College, Nanjing 210023, P. R. China.

出版信息

ACS Omega. 2020 Apr 1;5(14):8347-8354. doi: 10.1021/acsomega.0c00853. eCollection 2020 Apr 14.

DOI:10.1021/acsomega.0c00853
PMID:32309745
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7161063/
Abstract

A new μ-phenoxo-bridged dinuclear cobalt(II) complex, [Co(L)(acac)(HO)] (), has been synthesized by employing a new ligand, (4-methyl-2-formyl-6-(((2-trifluoromethyl)phenyl)methyliminomethyl) phenol) (HL). Structural analysis of complex reveals that the geometry around cobalt centers is best described as a distorted octahedron and the distance of cobalt neighbors is 3.128(0) Å. The magnetic property studies indicate that complex exhibits strong spin-orbit coupling effects and weak ferromagnetic coupling between two high-spin Co(II) centers linked by double μ-O bridges, with = 1.87(2) cm. The studies show that not only the Co-O-Co angle affects the alignment of the cobalt spins but also the dihedral angle between the CoOCo plane and the phenyl plane plays an important role in the magnetic coupling in this [CoO] system. Thus, the small bridging angles (96.96(11) and 96.91(11)°) and the large dihedral angles between the CoOCo plane and the phenyl plane (63.0(1) and 30.6(1)°) induce intramolecular ferromagnetic exchange interaction in complex .

摘要

通过使用新配体(4-甲基-2-甲酰基-6-(((2-三氟甲基)苯基)甲基亚氨基甲基)苯酚)(HL)合成了一种新的μ-苯氧基桥联双核钴(II)配合物[Co(L)(acac)(HO)]()。配合物的结构分析表明,钴中心周围的几何构型最好描述为扭曲的八面体,钴邻位原子间的距离为3.128(0) Å。磁性研究表明,配合物表现出强的自旋-轨道耦合效应以及通过双μ-O桥连接的两个高自旋Co(II)中心之间的弱铁磁耦合,J = 1.87(2) cm。研究表明,不仅Co-O-Co角影响钴自旋的排列,而且CoOCo平面与苯基平面之间的二面角在该[CoO]体系的磁耦合中也起着重要作用。因此,小的桥连角(96.96(11)和96.91(11)°)以及CoOCo平面与苯基平面之间的大二面角(63.0(1)和30.6(1)°)在配合物中诱导了分子内铁磁交换相互作用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be3d/7161063/9ca2a34416ef/ao0c00853_0005.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be3d/7161063/f5030073c048/ao0c00853_0007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be3d/7161063/ed4e3c353468/ao0c00853_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be3d/7161063/7f2406883983/ao0c00853_0009.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be3d/7161063/b3e4019c0d91/ao0c00853_0003.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/be3d/7161063/9ca2a34416ef/ao0c00853_0005.jpg

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