Probing the Axial Distortion Effect on the Magnetic Anisotropy of Octahedral Co(II) Complexes
Probing the Axial Distortion Effect on the Magnetic Anisotropy of Octahedral Co(II) Complexes
复制标题
探讨轴向畸变对八面体 Co(II) 配合物磁各向异性的影响
DOI：
10.1021/acs.inorgchem.0c00531
复制
发表时间：
2020-06-01
影响因子：
4.6
通讯作者：
Dunbar, Kim R.
中科院分区：
文献类型：
--
作者：
Deng, Yi-Fei;Singh, Mukesh Kumar;Dunbar, Kim R.
报道了三种单核八面体Co（II）配合物，[Co(py)(4)(SCN)(2)] (1), [Co(py)(4)(Cl)(2)]中心点H2O(2)和[Co(py)(4)(Br)(2)](3)，它们随着轴向位置的压缩(1)或伸长（2和3）表现出不同的畸变。所有配合物的磁、HFEPR和计算研究证实了易平面磁各向异性。进一步分析表明，零场分裂参数的符号和大小通过轴向和赤道配体场强度的调整而发生显著变化（D >= +/- 150 cm(-1)）。所有化合物都观察到慢磁弛豫，这是由涉及声子和光学声子的拉曼过程主导的。
Three mononuclear octahedral Co(II) complexes are reported, [Co(py)(4)(SCN)(2)] (1), [Co(py)(4)(Cl)(2)]center dot H2O (2), and [Co(py)(4)(Br)(2)] (3), that exhibit different distortions with compression (1) or elongation (2 and 3) of the axial positions. Easy plane magnetic anisotropy was confirmed by magnetic, HFEPR, and computational studies for all complexes. Further analyses indicate that both the sign and magnitude of zero-field splitting parameters experience a significant change (D >= +/- 150 cm(-1)) by tuning of the axial and equatorial ligand field strength. Slow magnetic relaxation is observed for all compounds which is dominated by the Raman process involving both acoustic and optical phonons.