Abrupt Spin Transition with Thermal Hysteresis of Iron(III) Complex [FeIII(Him)2(hapen)]AsF6 (Him = Imidazole, H2hapen = N,N′-Bis(2-hydroxyace

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• 作者：Takeshi Fujinami ; Masataka Koike ; Naohide Matsumoto ; Yukinari Sunatsuki ; Atsushi Okazawa ; Norimichi Kojima
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：February 17, 2014
• 年：2014
• 卷：53
• 期：4
• 页码：2254-2259
• 全文大小：357K
• ISSN：1520-510X

文摘

The solvent-free spin crossover iron(III) complex [Fe^III(Him)₂(hapen)]AsF₆ (Him = imidazole, H₂hapen = N,N鈥?bis(2-hydroxyacetophenylidene)ethylenediamine), exhibiting thermal hysteresis, was synthesized and characterized. The Fe^III ion has an octahedral coordination geometry, with N₂O₂ donor atoms of the planar tetradentate ligand (hapen) and two nitrogen atoms of two imidazoles at the axial positions. One of two imidazoles is hydrogen-bonded to the phenoxo oxygen atom of hapen of the adjacent unit to give a hydrogen-bonded one-dimensional chain, while the other imidazole group is free from hydrogen bonding. The temperature dependencies of the magnetic susceptibilities and M枚ssbauer spectra revealed an abrupt spin transition between the high-spin (S = 5/2) and low-spin (S = 1/2) states, with thermal hysteresis.