Chemical Excision of Tetrahedral FeSe2 Chains from the Superconductor FeSe: Synthesis, Crystal Structure, and Magnetism of Fe3Se4(en)2

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• 作者：Chongin Pak ; Saeed Kamali ; Joyce Pham ; Kathleen Lee ; Joshua T. Greenfield ; Kirill Kovnir
• 刊名：Journal of the American Chemical Society
• 出版年：2013
• 出版时间：December 26, 2013
• 年：2013
• 卷：135
• 期：51
• 页码：19111-19114
• 全文大小：290K
• ISSN：1520-5126

文摘

Fragments of the superconducting FeSe layer, FeSe₂ tetrahedral chains, were stabilized in the crystal structure of a new mixed-valent compound Fe₃Se₄(en)₂ (en = ethylenediamine) synthesized from elemental Fe and Se. The FeSe₂ chains are separated from each other by means of Fe(en)₂ linkers. M枚ssbauer spectroscopy and magnetometry reveal strong magnetic interactions within the FeSe₂ chains which result in antiferromagnetic ordering below 170 K. According to DFT calculations, anisotropic transport and magnetic properties are expected for Fe₃Se₄(en)₂. This compound offers a unique way to manipulate the properties of the Fe鈥揝e infinite fragments by varying the topology and charge of the Fe-amino linkers.