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Asymmetric Coordination Toward a Photoinduced Single‐Chain Magnet Showing High Coercivity Values
Author(s) -
Liu Qiang,
Hu JiXiang,
Meng YinShan,
Jiang WenJing,
Wang JunLi,
Wen Wen,
Wu Qiong,
Zhu HaiLang,
Zhao Liang,
Liu Tao
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202017249
Subject(s) - spin crossover , coercivity , nanomagnet , ligand (biochemistry) , crystallography , cyanide , chemistry , atom (system on chip) , magnet , ferromagnetism , pyridine , materials science , inorganic chemistry , condensed matter physics , magnetization , magnetic field , physics , medicinal chemistry , biochemistry , receptor , quantum mechanics , computer science , embedded system
The production of photo‐switchable molecular nanomagnets with substantial coercivity, which is indispensable for information storage and process applications, is challenging. Introducing photo‐responsive spin‐crossover units provides a feasible means of controlling the magnetic anisotropy, interactions, and overall nanomagnet properties. Herein, we report a cyanide‐bridged chain 1⋅12H 2 O ({[( Pz Tp)Fe III (CN) 3 ] 2 Fe II (Pmat) 2 } n ⋅12 H 2 O) generated by linking the Fe II ‐based spin‐crossover unit with the [( Pz Tp)Fe(CN) 3 ] − ( Pz Tp: tetrakis(pyrazolyl)borate) building block in the presence of asymmetric ditopic ligand Pmat ((4‐pyridine‐4‐yl)methyleneamino‐1,2,4‐triazole). Structural characterization revealed that the introduction of this asymmetric ligand led to a distorted coordination environment of Fe II ions, which were equatorially coordinated by four cyanide N atoms, and apically coordinated by one pyridine N atom and one triazole N atom. Upon 808‐nm light irradiation, 1⋅12H 2 O underwent photoinduced spin‐crossover and exhibited single‐chain magnet behavior with a coercive field of up to 1.3 T. This represents a 3d‐based photoinduced single‐chain magnet exhibiting pronounced hysteresis.