A pentagonal bipyramidal Co(II) single-ion magnet based on an asymmetric tetradentate ligand with easy plane anisotropy

被引:2
|
作者
Huang, Xing-Cai [1 ,3 ]
Yong, Wei [1 ]
Moorthy, Shruti [2 ]
Su, Zhang-Yu [1 ]
Kong, Jiao-Jiao [1 ]
Singh, Saurabh Kumar [2 ]
机构
[1] Yancheng Teachers Univ, Sch Chem & Environm Engn, Yancheng 224007, Peoples R China
[2] Indian Inst Technol Hyderabad, Dept Chem, Sangareddy 502285, Telangana, India
[3] Nanjing Univ, State Key Lab Coordinat Chem, Nanjing 210093, Peoples R China
基金
中国国家自然科学基金;
关键词
Co(II); Single -ion magnet; Easy plane anisotropy; Pentagonal bipyramid; Theoretical calculations; TRANSITION-METAL-COMPLEXES; STATE PERTURBATION-THEORY; COBALT(II) COMPLEX; RELAXATION; VALENCE; IMPLEMENTATION; APPROXIMATION; ENERGY; REDOX;
D O I
10.1016/j.poly.2022.116275
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
High-coordinate 3d single-ion magnets(SIMs) especially with pentagonal bipyramidal geometry as an emerging class of representative molecular magnets have received considerable concern. Whereas, it is not easy to construct and obtain 3d SIMs with high coordination numbers (CN = 7 or 8). Herein, a mononuclear Co(II) complex ([Co(pypzbeyz)(NCS)2(DMF)], pypzbeyz = N-((6-(1H-pyrazol-1-yl)pyridin-2-yl)methylene)benzohy-drazide) based on a tetradentate ligand has been synthesized and structurally and magnetically characterized. Single-crystal X-ray diffraction analysis reveals that the Co(II) complex adopts a seven-coordinate distorted pentagonal bipyramidal geometry. Magnetic investigations show that the Co(II) complex has large easy plane anisotropy with a positive D value (D = +36.8 cm-1) and a small E value, and exhibits slow magnetic relaxation behavior under a dc field. Theoretical calculations show a positive zero-field splitting of 33.5 cm-1, which is in excellent agreement with the experiment. The results support that the 3d high-coordinate SIMs could be effec-tively achieved by using a suitable multi-dentate ligand with a certain ligand field.
引用
收藏
页数:7
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