Department of Chemistry and Chemical Biology, Harvard University , 12 Oxford Street, Cambridge, Massachusetts 02138, United States.
Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University , Guangzhou 510275, P. R. China.
J Am Chem Soc. 2017 Nov 22;139(46):16474-16477. doi: 10.1021/jacs.7b09699. Epub 2017 Nov 9.
Magneto-structural correlation studies of mononuclear intermediate S = 3/2 Fe(III) complexes, (PMe)FeCl (1) and (PMePh)FeCl (2), demonstrate the influence of local symmetry on magnetic anisotropy. Symmetric compound 1 is characterized by a zero-field splitting (ZFS) parameter of D = -50(2) cm, leading to the observation of slow magnetic relaxation with an energy barrier of 81 cm along with magnetic hysteresis up to 4 K, whereas symmetrically perturbed compound 2 displays a much reduced ZFS parameter of D = -17(1) cm and energy barrier of U = 46 cm.
单核中间 S = 3/2Fe(III)配合物(PMe)FeCl(1)和(PMePh)FeCl(2)的磁结构相关性研究表明，局部对称性对磁各向异性有影响。对称化合物 1 的零场分裂(D)参数为 D = -50(2)cm，表现出缓慢的磁弛豫，在 81cm 处有能量势垒，同时在 4 K 以下有磁滞现象，而对称受扰的化合物 2 的 D 值则显著降低，为 D = -17(1)cm，能量势垒为 U = 46cm。
