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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Dynamic magnetism of an iron(II)-chlorido spin chain and its hexametallic segment
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Dynamic magnetism of an iron(II)-chlorido spin chain and its hexametallic segment

机译：铁（II）-氯离子自旋链及其六金属链段的动态磁性

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An air-stable iron(II) chain compound [Fe(phen)(Cl)(2)](n) (1, phen = 1,10-phenanthroline) was prepared and exhibits intrachain ferromagnetic interactions as well as competing interchain antiferromagnetic interactions that are mediated by pi-pi stacking of the phen ligands, resulting in metamagnetic behaviour. The interchain interactions can be altered by changing the external magnetic field, and disparate magnetic dynamics was thus observed from zero to the critical field of 1500 Oe. Zero-field cooled (ZFC) and fieldcooled (FC) magnetization and heat capacity measurements indicate that long-range antiferromagnetic ordering occurs at lower fields, and this ordering disappears when the external field is larger than 1500 Oe. The low-frequency ac susceptibility data are consistent with the exponential increase of the temperature- dependent dc data, indicating a Glauber-type dynamics under the field of 1500 Oe. Thus, 1 is considered as a metamagnetic single-chain magnet. For further analysis, a discrete hexametallic segment of the chain, [Fe-6(phen)(6)(Cl)(12)] (2), was also isolated and was shown to possess a high-spin ground state and display slow magnetic relaxations like single-molecule magnets. Magnetic analysis using CONDON suggests weak ferromagnetic interactions between the metal centres. The polymeric compound 1 can be viewed as being constructed using the hexametallic unit 2 which is of a low energy barrier, suggesting the significance of intrachain ferromagnetic interactions in enhancing the spin-reversal energy barrier of the short chains.
机译：制备了一种空气稳定的铁（II）链化合物[Fe（phen）（Cl）（2）]（n）（1，phen = 1,10-菲咯啉），并表现出链内铁磁相互作用以及竞争性链间反铁磁相互作用它们是由phen配体的pi-pi堆积介导的，导致超磁行为。链间相互作用可以通过改变外部磁场来改变，因此从零到1500 Oe的临界场观察到完全不同的磁动力学。零场冷却（ZFC）和场冷（FC）的磁化和热容测量表明，远场反铁磁有序发生在较低的磁场中，当外部磁场大于1500 Oe时，这种有序消失。低频交流磁化率数据与温度相关的直流数据呈指数增长相一致，这表明在1500 Oe磁场下出现了Glauber型动力学。因此，1被认为是亚磁性单链磁体。为了进一步分析，还分离了该链的离散六金属链段[Fe-6（phen）（6）（Cl）（12）]（2），并显示其具有高自旋基态且显示缓慢像单分子磁体一样的磁弛豫。使用CONDON进行的磁分析表明，金属中心之间的铁磁相互作用较弱。可以将高分子化合物1看作是使用具有低能垒的六金属单元2构造的，这表明链内铁磁相互作用对于增强短链的自旋反转能垒具有重要意义。

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