Hysteretic Spin Crossover in Two-Dimensional (2D) Hofmann-Type Coordination Polymers

Three new two-dimensional (2D) Hofmann-type coordination polymers with general formula [Fe­(3-NH2py)2M­(CN)4] (3-NH2py = 3-aminopyridine, M = Ni (1), Pd (2), Pt (3)) have been synthesized. Magnetic susceptibility measurements show that they exhibited cooperative spin crossover (SCO) with remarkable...

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Bibliographic Details
Published in:Inorganic chemistry 2015-09, Vol.54 (17), p.8711-8716
Main Authors: Liu, Wei, Wang, Lu, Su, Yu-Jun, Chen, Yan-Cong, Tucek, Jiri, Zboril, Radek, Ni, Zhao-Ping, Tong, Ming-Liang
Format: Article
Language:English
Subjects:
Coordination polymers
Covalent bonds
Crossovers
Hydrogen bonds
Hysteresis
Ligands
Magnetic permeability
Two dimensional
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Summary:Three new two-dimensional (2D) Hofmann-type coordination polymers with general formula [Fe­(3-NH2py)2M­(CN)4] (3-NH2py = 3-aminopyridine, M = Ni (1), Pd (2), Pt (3)) have been synthesized. Magnetic susceptibility measurements show that they exhibited cooperative spin crossover (SCO) with remarkable hysteretic behaviors. Their hysteresis widths are 25, 37, and 30 K for 1–3, respectively. The single-crystal structure of 1 suggest that the pseudo-octahedral Fe sites are equatorially bridged by [M­(CN)4]2– to form 2D grids and axially coordinated by 3-NH2py ligands. The intermolecular interactions between layers (the offset face-to-face π···π interactions, hydrogen bonds, and weak Namino···NiII contacts) together with the covalent bonds bridged by [M­(CN)4]2– units are responsible to the significant cooperativity.
ISSN:0020-1669
1520-510X
DOI:10.1021/acs.inorgchem.5b01341